- Computer Science and Information Technology
- 000 Generalities (e.g. 004 Data processing & computer science)
- Mathematics and Statistics
- 500 Natural sciences & mathematics (e.g. 510 Mathematics)
- Physical Sciences and Engineering
- 500 Natural sciences & mathematics (e.g. 530 Physics)
- Life and Health Sciences
- 500 Natural sciences & mathematics (e.g. 570 Life sciences)
- Social and Behavioral Sciences
- 300 Social sciences (e.g. 302 Social interaction)
- Education and Pedagogy
- 300 Social sciences (e.g. 370 Education)
- Humanities
- 800 Literature & rhetoric (e.g. 810 American literature)
- Arts and Aesthetics
- 700 The arts (e.g. 740 Drawing & decorative arts)
- Business and Economics
- 300 Social sciences (e.g. 330 Economics)
- Law and Justice
- 300 Social sciences (e.g. 340 Law)
- Philosophy and Religion
- 100 Philosophy & psychology (e.g. 100 Philosophy)
- Language and Linguistics
- 400 Language (e.g. 420 English & Old English)
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