I think most times mentioned ranked ddc for me

I think most times mentioned ranked ddc for me

50X Natural sciences and mathematics > General Science>>>>
00X Information > Computing And Information>>>>
5 Information > Computing And Information > Computer Software>>>
5.1 Information > Computing And Information > Computer Software > Programming>>
0XX Information>>>>>
5.13 Information > Computing And Information > Computer Software > Programming > Languages>
51X Natural sciences and mathematics > Mathematics>>>>
150 Philosophy and Psychology > Psychology > Psychology>>>
1XX Philosophy and Psychology>>>>>
1 Information > Computing And Information > Knowledge>>>
1.4 Information > Computing And Information > Knowledge > Research And Data Display>>
1.42 Information > Computing And Information > Knowledge > Research And Data Display>>
300 Social Sciences > Social Sciences, Sociology, Anthropology > Social Sciences>>>
300.7 Social Sciences > Social Sciences, Sociology, Anthropology > Social Sciences > Education And Research>>
300.72 Social Sciences > Social Sciences, Sociology, Anthropology > Social Sciences > Education And Research > Social sciences–research>
5XX Natural sciences and mathematics>>>>>
12X Philosophy and Psychology > Philosophy Of Humanity>>>>
153 Philosophy and Psychology > Psychology > Cognition And Memory>>>
52X Natural sciences and mathematics > Astronomy>>>>
53X Natural sciences and mathematics > Physics>>>>
90X History & Geography > History>>>>
15X Philosophy and Psychology > Psychology>>>>
17X Philosophy and Psychology > Ethics>>>>
19X Philosophy and Psychology > Modern western philosophy>>>>
3 Information > Computing And Information > Systems Theory>>>
300.1 Social Sciences > Social Sciences, Sociology, Anthropology > Social Sciences > Philosophy and Theory>>
330.01 Social Sciences > Economics > Economics > > > Philosophy And Psychology
332.6 Social Sciences > Economics > Finance > Investing>>
4 Information > Computing And Information > Data processing, computer science>>>
519 Natural sciences and mathematics > Mathematics > Applied Mathematics, Probabilities>>>
519.5 Natural sciences and mathematics > Mathematics > Applied Mathematics, Probabilities > Statistical Mathematics>>
519: Probabilities & applied mathematics>>>>>
6 Information > Computing And Information > Special Topics>>>
6.3 Information > Computing And Information > Special Topics > Artificial Intelligence>>
515 Natural sciences and mathematics > Mathematics > Analysis>>>
530 Natural sciences and mathematics > Physics > Physics>>>
160 Philosophy and Psychology > Logic > Logic>>>
16X Philosophy and Psychology > Logic>>>>
294 Religion > Other Religions > Religions of Indic origin>>>
301 Social Sciences > Social Sciences, Sociology, Anthropology > Sociology, Anthropology>>>
501 Natural sciences and mathematics > General Science > Philosophy and theory>>>
57X Natural sciences and mathematics > Life Sciences, Biology>>>>
620: Engineering & allied operations>>>>>
72X Arts and Recreation > Architecture>>>>
745 Arts and Recreation > Drawing and decorative arts > Decorative Art And Design>>>
1.6 Information > Computing And Information > Knowledge > Computer Science>>
1.64 Information > Computing And Information > Knowledge > Computer Science>>
10X Philosophy and Psychology > Philosophy>>>>
128 Philosophy and Psychology > Philosophy Of Humanity > The Human Condition>>>
133 Philosophy and Psychology > Parapsychology And Occultism > Specific Topics>>>
13X Philosophy and Psychology > Parapsychology And Occultism>>>>
303 Social Sciences > Social Sciences, Sociology, Anthropology > Social Processes>>>
4.1 Information > Computing And Information > Data processing, computer science > By Computer Type>>
4.16 Information > Computing And Information > Data processing, computer science > By Computer Type > Personal Computers>
4.6 Information > Computing And Information > Data processing, computer science > Networking>>
5.4 Information > Computing And Information > Computer Software > Compilers And Operating Systems>>
5.43 Information > Computing And Information > Computer Software > Compilers And Operating Systems > Unix-Like>
5.44 Information > Computing And Information > Computer Software > Compilers And Operating Systems>>
5.8 Information > Computing And Information > Computer Software > Computer Security>>
511 Natural sciences and mathematics > Mathematics > General Principles>>>
511.3 Natural sciences and mathematics > Mathematics > General Principles > Mathematical (Symbolic) logic>>
530.1 Natural sciences and mathematics > Physics > Physics > Theoretical Physics>>
531 Natural sciences and mathematics > Physics > Mechanics>>>
537 Natural sciences and mathematics > Physics > Electricity>>>
621: Applied physics>>>>>
93X History & Geography > Ancient World>>>>
100: Philosophy & psychology>>>>>
160: Logic>>>>>
20X Religion > Religion>>>>
21X Religion > Theory>>>>
230 Religion > Christianity > Christianity, Christian theology>>>
23X Religion > Christianity>>>>
29X Religion > Other Religions>>>>
300: Social sciences>>>>>
320 Social Sciences > Political Science > Political Science>>>
500 Natural sciences and mathematics > General Science > General Science>>>
511: General principles of mathematics>>>>>
519.53 Natural sciences and mathematics > Mathematics > Applied Mathematics, Probabilities > Statistical Mathematics>>
523 Natural sciences and mathematics > Astronomy > Astronomical objects and astrophysics>>>
60X Technology > General Technology>>>>
612 Technology > Medicine > Physiology>>>
658 Technology > Management and auxiliary services > Management>>>
65X Technology > Management and auxiliary services>>>>
793 Arts and Recreation > Amusements and Recreation > Indoor Amusements>>>
793.7 Arts and Recreation > Amusements and Recreation > Indoor Amusements > Board games, mental puzzles>>
793.74 Arts and Recreation > Amusements and Recreation > Indoor Amusements > Board games, mental puzzles > Mathematical Games And Puzzles>
809 Literature > By Topic > History and criticism of three or more literatures>>>
830 Literature > German & Germanic > German Literature>>>
833 Literature > German & Germanic > Fiction>>>
833.9 Literature > German & Germanic > Fiction > Modern period (1900-)>>
83X Literature > German & Germanic>>>>
930 History & Geography > Ancient World > Ancient History>>>
001: Knowledge>>>>>
003: Systems>>>>>
100 Philosophy and Psychology > Philosophy > General Philosophy>>>
110 Philosophy and Psychology > Metaphysics > Metaphysics>>>
11X Philosophy and Psychology > Metaphysics>>>>
121 Philosophy and Psychology > Philosophy Of Humanity > Epistemology>>>
133.1 Philosophy and Psychology > Parapsychology And Occultism > Specific Topics > Apparition – Ghosts>>
133.8 Philosophy and Psychology > Parapsychology And Occultism > Specific Topics > Psychic Phenomena>>
133.9 Philosophy and Psychology > Parapsychology And Occultism > Specific Topics > Spiritism – Table-tipping, etc.>>
14X Philosophy and Psychology > Philosophical Systems>>>>
170 Philosophy and Psychology > Ethics > Ethics — Subdivisions>>>
190 Philosophy and Psychology > Modern western philosophy > Modern Philosophers>>>
190: Modern western philosophy>>>>>
294.3 Religion > Other Religions > Religions of Indic origin > Buddhism>>
299 Religion > Other Religions > By Region/Civilization>>>
302.2 Social Sciences > Social Sciences, Sociology, Anthropology > Social Interaction > Communication>>
303.4 Social Sciences > Social Sciences, Sociology, Anthropology > Social Processes > Social change>>
32X Social Sciences > Political Science>>>>
330 Social Sciences > Economics > Economics > >>
330 Social Sciences > Economics > Economics>>>
398.4 Social Sciences > Customs, Etiquette, Folklore > Folklore > Paranatural and legendary phenomena as subjects of folklore>>
501: Philosophy & theory>>>>>
508 Natural sciences and mathematics > General Science > Natural history>>>
551 Natural sciences and mathematics > Earth sciences & geology > Geology, Hydrology Meteorology>>>
599 Natural sciences and mathematics > Zoology > Mammals>>>
59X Natural sciences and mathematics > Zoology>>>>
621 Technology > Engineering and allied operations > Applied physics>>>
621.3 Technology > Engineering and allied operations > Applied physics > Electrical, magnetic, optical, communications, computer engineering; electronics, lighting>>
621.38 Technology > Engineering and allied operations > Applied physics > Electrical, magnetic, optical, communications, computer engineering; electronics, lighting > Electronics, communications engineering>
62X Technology > Engineering and allied operations>>>>
658.4 Technology > Management and auxiliary services > Management > Executive>>
909 History & Geography > History > World history>>>
932 History & Geography > Ancient World > Ancient Egypt to 640>>>
973.9 History & Geography > North America > United States > 1901->>
973.91 History & Geography > North America > United States > 1901- > Roosevelt Through Truman Administrations>
973.92 History & Geography > North America > United States > 1901- > Eisenhower Through Clinton Administrations>
973.93 History & Geography > North America > United States > 1901- > Bush Administration And Beyond>
004: Data processing & computer science>>>>>
005: Computer programming, programs & data>>>>>
08X Information > Quotations>>>>
150: Psychology>>>>>
152 Philosophy and Psychology > Psychology > Emotions And Senses>>>
155 Philosophy and Psychology > Psychology > Developmental And Differential Psychology>>>
155.4 Philosophy and Psychology > Psychology > Developmental And Differential Psychology > Childhood>>
158 Philosophy and Psychology > Psychology > Applied Psychology>>>
174 Philosophy and Psychology > Ethics > Professional and Business Ethics>>>
174.2 Philosophy and Psychology > Ethics > Professional and Business Ethics > Physicians>>
179 Philosophy and Psychology > Ethics > Other Ethical Topics>>>
291 Religion > Other Religions > Comparative Religion; Mythology (No Longer Used)>>>
302 Social Sciences > Social Sciences, Sociology, Anthropology > Social Interaction>>>
303.48 Social Sciences > Social Sciences, Sociology, Anthropology > Social Processes > Social change > Causes of change>
31 Information > Dictionaries And Encyclopedias > American>>>
330 Social Sciences > Economics > Economics > >>
330 Social Sciences > Economics > Economics>>>
330: Economics>>>>>
333: Economics of land & energy>>>>>
338.7 Social Sciences > Economics > Production > Business Enterprises>>
338.76 Social Sciences > Economics > Production > Business Enterprises > By Industry>
344 Social Sciences > Law > Labor, social service, education, cultural law [Option B: Law > Europe]>>
362 Social Sciences > Social problems and services; associations > Social problems of & services to groups of people>>>
362.1 Social Sciences > Social problems and services; associations > Social problems of & services to groups of people > People with physical ailments>>
362.17 Social Sciences > Social problems and services; associations > Social problems of & services to groups of people > People with physical ailments > Hospice Care>
362.19 Social Sciences > Social problems and services; associations > Social problems of & services to groups of people > People with physical ailments > Services to people with specific conditions>
363.25 Social Sciences > Social problems and services; associations > Other Problems And Services > Police Services > Criminal investigation>
36X Social Sciences > Social problems and services; associations>>>>
370: Education>>>>>
40X Language > Language>>>>
428 Language > English > Standard English usage (Prescriptive linguistics)>>>
508.7 Natural sciences and mathematics > General Science > Natural history>>>
520 Natural sciences and mathematics > Astronomy > Astronomy>>>
551.5 Natural sciences and mathematics > Earth sciences & geology > Geology, Hydrology Meteorology > Meteorology; Climate>>
55X Natural sciences and mathematics > Earth sciences & geology>>>>
570 Natural sciences and mathematics > Life Sciences, Biology > Life Sciences>>>
571 Natural sciences and mathematics > Life Sciences, Biology > Physiology and related subjects>>>
573 Natural sciences and mathematics > Life Sciences, Biology > Physiological systems in animals>>>
574 Natural sciences and mathematics > Life Sciences, Biology > Biology>>>
574.5 Natural sciences and mathematics > Life Sciences, Biology > Biology > Ecology>>
576 Natural sciences and mathematics > Life Sciences, Biology > Microbiology>>>
577 Natural sciences and mathematics > Life Sciences, Biology > Nature of Life>>>
581 Natural sciences and mathematics > Botany > Physiologic and Structural>>>
582 Natural sciences and mathematics > Botany > Phanerogamia>>>
582.1 Natural sciences and mathematics > Botany > Phanerogamia>>>
58X Natural sciences and mathematics > Botany>>>>
591 Natural sciences and mathematics > Zoology > Specific topics in natural history of animals>>>
595 Natural sciences and mathematics > Zoology > Arthropoda>>>
595.7 Natural sciences and mathematics > Zoology > Arthropoda > Insects: Insecta, Hexapoda>>
598 Natural sciences and mathematics > Zoology > Birds>>>
598.2 Natural sciences and mathematics > Zoology > Birds > Birds: Aves>>
599.7 Natural sciences and mathematics > Zoology > Mammals > Ungulata, Carnivora, Domestic mammals>>
600: Technology>>>>>
610: Medicine & health>>>>>
612.8 Technology > Medicine > Physiology > Nervous system>>
612: Human physiology>>>>>
616 Technology > Medicine > Pathology; Diseases; Treatment>>>
616.8 Technology > Medicine > Pathology; Diseases; Treatment > Diseases of nervous system>>
616.85 Technology > Medicine > Pathology; Diseases; Treatment > Diseases of nervous system > Neuroses>
616.89 Technology > Medicine > Pathology; Diseases; Treatment > Diseases of nervous system>>
618 Technology > Medicine > Gynecology and Pediatrics>>>
618.9 Technology > Medicine > Gynecology and Pediatrics > Pediatrics & Geriatrics>>
618.92 Technology > Medicine > Gynecology and Pediatrics > Pediatrics & Geriatrics > Pediatric Care>
61X Technology > Medicine>>>>
621.39 Technology > Engineering and allied operations > Applied physics > Electrical, magnetic, optical, communications, computer engineering; electronics, lighting > Computer engineering>
629.8 Technology > Engineering and allied operations > Other Branches > Automata>>
649 Technology > Home and family management > Parenting, Caregiving>>>
649.1 Technology > Home and family management > Parenting, Caregiving > Parenting>>
651 Technology > Management and auxiliary services > Office Equipment and Methods>>>
652 Technology > Management and auxiliary services > Writing: Materials, Typewriters>>>
658.05 Technology > Management and auxiliary services > Management>>>
658.1 Technology > Management and auxiliary services > Management > Of Corporate Finance>>
658.8 Technology > Management and auxiliary services > Management > Of Marketing>>
658.87 Technology > Management and auxiliary services > Management > Of Marketing>>
686 Technology > Manufacture of products for specific uses, handicrafts > Books: Binding, Design, Printing>>>
686.2 Technology > Manufacture of products for specific uses, handicrafts > Books: Binding, Design, Printing > Printing>>
686.22 Technology > Manufacture of products for specific uses, handicrafts > Books: Binding, Design, Printing > Printing > Typography>
775 Arts and Recreation > Photography > Photography: Digital techniques>>>
794 Arts and Recreation > Amusements and Recreation > Games Of Skill>>>
794.8 Arts and Recreation > Amusements and Recreation > Games Of Skill > Video Games>>
794.81 Arts and Recreation > Amusements and Recreation > Games Of Skill > Video Games>>
796.5 Arts and Recreation > Amusements and Recreation > Athletic and outdoor sports and games > Outdoor Leisure>>
796.52 Arts and Recreation > Amusements and Recreation > Athletic and outdoor sports and games > Outdoor Leisure > Exploring geological features (mountains, caves …)>
80 Information > Quotations > Anthologies; Quotations>>>
808 Literature > By Topic > Anthologies and rhetoric > Rhetoric; Other Writing Instruction>>
941 History & Geography > Europe > British Isles > Historical periods of British Isles>>
947 History & Geography > Europe > Russia and Eastern Europe [also, more Finland]>>>
973 History & Geography > North America > United States>>>
006: Special computer methods>>>>>
019 Philosophy and Psychology > Modern western philosophy>>>>
03X Information > Dictionaries And Encyclopedias>>>>
1.9 Information > Computing And Information > Knowledge > Controversial knowledge>>
100 Philosophy and Psychology>>>>>
109 Philosophy and Psychology > Philosophy > Historical and collected persons treatment of philosophy>>>
133.4 Philosophy and Psychology > Parapsychology And Occultism > Specific Topics > Witchcraft – Sorcery>>
171 Philosophy and Psychology > Ethics > Theories of Ethics>>>
18X Philosophy and Psychology > Ancient, medieval and eastern philosophy>>>>
192 Philosophy and Psychology > Modern western philosophy > British>>>
193 Philosophy and Psychology > Modern western philosophy > Germany and Austria>>>
194 Philosophy and Psychology > Modern western philosophy > French>>>
200: Religion>>>>>
296 Religion > Other Religions > Judaism>>>
320: Political science>>>>>
330 Social Sciences > Economics > Economics > >>
330 Social Sciences > Economics > Economics > >>
330 Social Sciences > Economics > Economics > >>
330 Social Sciences > Economics > Economics>>>
330 Social Sciences > Economics > Economics>>>
330 Social Sciences > Economics > Economics>>>
333 Social Sciences > Economics > Economics of land & energy>>>
333.9 Social Sciences > Economics > Economics of land & energy > Hydrospheric, Atmospheric, and Biospheric Resources>>
355 Social Sciences > Public Administration, Military Science > Military Science>>>
359 Social Sciences > Public Administration, Military Science > Navy; Naval Science>>>
35X Social Sciences > Public Administration, Military Science>>>>
363 Social Sciences > Social problems and services; associations > Other Problems And Services>>>
363.1 Social Sciences > Social problems and services; associations > Other Problems And Services > Health And Safety>>
363.12 Social Sciences > Social problems and services; associations > Other Problems And Services > Health And Safety > Transportation>
363.3 Social Sciences > Social problems and services; associations > Other Problems And Services > Other Public Safety Concerns>>
363.34 Social Sciences > Social problems and services; associations > Other Problems And Services > Other Public Safety Concerns > Disasters (natural and otherwise)>
363.7 Social Sciences > Social problems and services; associations > Other Problems And Services > Environment>>
363.73 Social Sciences > Social problems and services; associations > Other Problems And Services > Environment > Environmental problems>
366 Social Sciences > Social problems and services; associations > Secret Societies (Freemasons, Knights Templar)>>>
387 Social Sciences > Commerce, Communications, Transportation > Rivers, Oceans, and Flight>>>
387.2 Social Sciences > Commerce, Communications, Transportation > Rivers, Oceans, and Flight > Ocean travel>>
39X Social Sciences > Customs, Etiquette, Folklore>>>>
410: Linguistics>>>>>
500: Natural sciences & mathematics>>>>>
512: Algebra>>>>>
526 Natural sciences and mathematics > Astronomy > Mathematical geography>>>
530: Physics>>>>>
551: Geology, hydrology & meteorology>>>>>
56X Natural sciences and mathematics > Fossils & prehistoric life>>>>
620 Technology > Engineering and allied operations > Engineering>>>
623 Technology > Engineering and allied operations > Military Engineering and Marine Engineering>>>
623.8 Technology > Engineering and allied operations > Military Engineering and Marine Engineering > Naval architecture; Shipbilding>>
623.82 Technology > Engineering and allied operations > Military Engineering and Marine Engineering > Naval architecture; Shipbilding > History of Naval Architecture>
629.4 Technology > Engineering and allied operations > Other Branches > Astronauts and Space Travel>>
68X Technology > Manufacture of products for specific uses, handicrafts>>>>
741.6 Arts and Recreation > Drawing and decorative arts > Drawing & drawings > Graphic design, illustration, commercil art>>
771 Arts and Recreation > Photography > Techniques, equipment, materials>>>
778 Arts and Recreation > Photography > Special Applications>>>
778.5 Arts and Recreation > Photography > Special Applications > Film making>>
77X Arts and Recreation > Photography>>>>
797 Arts and Recreation > Amusements and Recreation > Water & Aerial Sports>>>
797.1 Arts and Recreation > Amusements and Recreation > Water & Aerial Sports > Boating>>
797.12 Arts and Recreation > Amusements and Recreation > Water & Aerial Sports > Boating>>
814 Literature > American And Canadian > Essays>>>
818.5 Literature > American And Canadian > Authors, American and American Miscellany > 20th Century>>
818.54 Literature > American And Canadian > Authors, American and American Miscellany > 20th Century>>
88X Literature > Greek and other Classical languages>>>>
901 History & Geography > History > Philosophy & theory>>>
910 History & Geography > Geography and Travel > Geography and Travel>>>
910.9 History & Geography > Geography and Travel > Geography and Travel > Biography And History>>
910: Geography & travel>>>>>
912 History & Geography > Geography and Travel > Maps and Atlases>>>
917.9 History & Geography > Geography and Travel > North America > West Coast U.S.>>
930: History of ancient world to ca. 499>>>>>
941.08 History & Geography > Europe > British Isles > Historical periods of British Isles > 1837- Period of Victoria and House of Windsor>
944.04 History & Geography > Europe > France And Monaco > France > Revolution 1789-1804>
947.08 History & Geography > Europe > Russia and Eastern Europe [also, more Finland] > Russian & Slavic History by Period > 1855->
956 History & Geography > Asia > Middle East > Middle East>>
971.06 History & Geography > North America > Canada > Canada > Canada 1911-1999>
973.31 History & Geography > North America > United States > Revolution and confederation (1775-89) > Political history; causes, results>
973.4 History & Geography > North America > United States > Constitutional period (1789-1809)>>
979 History & Geography > North America > West Coast U.S.>>>

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