| Class A |
General Works |
| Class B-BF |
Philosophy. Psychology |
| Class BH-BX |
Aesthetics. Ethics. Religion |
| Class C |
Archaeology. Biography |
| Class D |
History (General) |
| Class DA-DR |
History of Europe |
| Class DS |
History of Asia |
| Class DT-DX |
History of Africa. Oceania. Gypsies |
| Class E-F |
History: America |
| Class G-GC |
Geography |
| Class GE |
Environmental Sciences. Human Ecology |
| Class GN-GT |
Anthropology. Folklore. Manners and Customs |
| Class GV |
Recreation. Leisure |
| Class H-HA |
Social Sciences (General). Statistics |
| Class HB |
Economic Theory. Demography |
| Class HC |
Economic History and Conditions |
| Class HD |
Industries. Land Use. Labour |
| Class HE |
Transportation and Communications |
| Class HF |
Commerce, Business and Management |
| Class HG-HJ |
Finance. Public Finance including Taxation |
| Class HM-HN |
Sociology. Social History and Conditions |
| Class HQ |
The Family. Marriage. Woman |
| Class HS-HT |
Societies: secret, benevolent, etc. Communities. Classes. Races |
| Class HV-HX |
Social Pathology. Social and Public Welfare. Criminology. Socialism. Communism |
| Class J |
Political Science |
| Class K |
Law |
| Class L |
Education |
| Class M |
Music |
| Class N |
Visual Arts |
| Class NA |
Architecture |
| Class NB-ND |
Sculpture. Drawing. Design. Illustration. Painting |
| Class NE-NX |
Print media. Decorative Arts. Arts in General |
| Class P-PB |
Language and Literature (General). Greek. Latin. Modern Languages |
| Class PC-PD |
Romanic Languages (Italian, French, Spanish, Portuguese, etc.). Germanic Languages |
| Class PE |
English Language |
| Class PF-PK |
Languages: German, Russian, etc. |
| Class PL |
Language and Literature of Eastern Asia, Africa, Oceania |
| Class PN |
Literature (General). Poetry. Performing Arts. Drama. Radio and Television Broadcasts. Short Films. Experimental Films |
| Class PQ |
French Literature. Italian Literature. Spanish Literature. Portuguese Literature |
| Class PR |
English Literature |
| Class PS |
American Literature |
| Class PT |
German Literature. Other European Literature |
| Class PZ3 |
Motion Pictures, Chinese |
| Class PZ4 |
Motion Pictures, non-Chinese |
| Class PZ5-90 |
Juvenile belles letters |
| Class Q |
Science (General) |
| Class QA |
Mathematics. Computer Science (Software) |
| Class QB |
Astronomy |
| Class QC |
Physics |
| Class QD |
Chemistry |
| Class QE |
Geology |
| Class QH |
Natural History - General, Biology - General, Ecology |
| Class QK |
Botany |
| Class QL |
Zoology |
| Class QM-QP |
Human Anatomy. Physiology |
| Class QR |
Microbiology |
| Class R |
Medicine |
| Class S |
Agriculture |
| Class T |
Technology |
| Class TA |
Civil Engineering |
| Class TC |
Hydraulic Engineering. Ocean Engineering |
| Class TD |
Environmental Technology. Sanitary Engineering |
| Class TE-TG |
Highway Engineering. Railroad Engineering. Bridge Engineering |
| Class TH |
Building Construction |
| Class TJ |
Mechanical Engineering and Machinery |
| Class TK |
Electrical Engineering. Electronics. Computing Science (Hardware) |
| Class TL |
Motor Vehicles. Aeronautics. Astronautics |
| Class TN |
Mining Engineering. Metallurgy |
| Class TP |
Chemical Technology |
| Class TR |
Photography |
| Class TS |
Manufactures |
| Class TT |
Handicrafts |
| Class TX |
Home Economics |
| Class U-V |
Military Science. Naval Science |
| Class Z |
Word Processing. Publishing. Bibliography. Library Science. Information Resources (General) |
