Group 1: Philosophy, Epistemology, and Knowledge
1 Philosophy & psychology (Broad)
11 Metaphysics (General)
12 Epistemology (General)
115 Time (Specific)
120 Epistemology, causation & humankind (Specific)
122 Causation (Specific)
401 Philosophy & theory (Specific)
Group 2: Science, Mathematics, and Technology
0 Computer science, information & general works (Broad)
4 Language (Broad)
5 Science (Broad)
6 Technology (Broad)
51 Mathematics (General)
52 Astronomy (General)
53 Physics (General)
54 Chemistry (General)
55 Earth sciences & geology (General)
57 Life sciences; biology (General)
58 Plants (Botany) (General)
59 Animals (Zoology) (General)
500 Natural sciences & mathematics (Specific)
511 General principles of mathematics (Specific)
512 Algebra (Specific)
515 Analysis (Specific)
516 Geometry (Specific)
514 Topology (Specific)
518 Numerical analysis (Specific)
519 Probabilities & applied mathematics (Specific)
Group 3: Engineering and Applied Sciences
620 Engineering & allied operations (Specific)
621 Applied physics (Specific)
629 Other branches of engineering (Specific)
627 Hydraulic engineering (Specific)
623 Military & nautical engineering (Specific)
669 Metallurgy (Specific)
Group 4: Computer Science and Data Processing
005 Computer programming, programs & data (Specific)
004 Data processing & computer science (Specific)
006 Special computer methods (Specific)
003 Systems (Specific)
Group 5: Social Sciences, Culture, and Institutions
2 Religion (Broad)
3 Social sciences (Broad)
301 Sociology & anthropology (General)
302 Social interaction (General)
303 Social processes (General)
306 Culture & institutions (Specific)
Group 6: Economics and Commerce
32 Political science (General)
33 Economics (General)
336 Public finance (Specific)
332 Financial economics (Specific)
333 Economics of land & energy (Specific)
337 International economics (Specific)
338 Production (Specific)
331 Labor economics (Specific)
339 Macroeconomics & related topics (Specific)
381 Commerce (Specific)
Group 7: Literature, Arts, and Recreation
7 Arts & recreation (Broad)
8 Literature (Broad)
70 Arts (General)
71 Landscaping & area planning (General)
72 Architecture (General)
79 Sports, games & entertainment (General)
80 Literature, rhetoric & criticism (General)
78 Music (General)
Group 8: History, Geography, and Library & Information Sciences
9 History & geography (Broad)
90 History (General)
91 Geography & travel (General)
02 Library & information sciences (General)
021 Library relationships (Specific)
025 Library operations (Specific)
027 General libraries (Specific)
022 Administration of physical plant (Specific)
028 Reading & use of other information media (Specific)
Group 9: Earth Sciences, Physics, and Chemistry
540 Chemistry & allied sciences (Specific)
541 Physical chemistry (Specific)
550 Earth sciences (Specific)
551 Geology, hydrology & meteorology (Specific)
532 Fluid mechanics; liquid mechanics (Specific)
535 Light & infrared & ultraviolet phenomena (Specific)
537 Electricity & electronics (Specific)
531 Classical mechanics; solid mechanics (Specific)
539 Modern physics (Specific)
Group 10: Health, Medicine, and Physiology
61 Medicine & health (General)
612 Human physiology (Specific)
616 Diseases (Specific)
571 Physiology & related subjects (Specific)
572 Biochemistry (Specific)
Group 11: Linguistics and Literature
41 Linguistics (General)
43 German & related languages (General)
81 American literature in English (General)
82 English & Old English literatures (General)
83 German & related literatures (General)
Group 12: Performance Arts and Sports
791 Public performances (Specific)
792 Stage presentations (Specific)
796 Athletic & outdoor sports & games (Specific)
Group 13: European History
94 History of Europe (General)
941 British Isles (Specific)
943 Central Europe; Germany (Specific)
These groupings aim to capture the main themes and topics in Kenneth Udut’s writings while considering the specificity of the categories. Note that some subjects may fit into multiple groups or overlap. However, this organization provides a general framework for understanding the various areas of interest in his writings.