| A | General Works |
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| B | Philosophy, Psychology, Religion |
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| B - BJ | Philosophy, Psychology |
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| BL, BM, BP, BQ | Religion: Religions, Hinduism, Judaism, Islam, Buddhism |
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| BR - BV | Religion: Christianity, Bible |
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| BX | Religion: Christian Denominations |
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| C | Auxiliary Sciences of History |
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| D | History: General and Old World |
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| D - DJ | History (General), History of Europe, Part 1 |
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| DJK - DK | History of Eastern Europe (General). Soviet Union, Poland |
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| DL - DR | History of Europe, Part 2 |
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| DS | History of Asia |
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| DT - DX | History of Africa, Australia, New Zealand, etc. |
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| E - F | History: America (Western Hemisphere) |
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| G | Geography, Maps, Anthropology, Recreation |
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| H | Social Sciences |
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| H - HJ | Social Sciences: Economics |
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| HM - HX | Social Sciences: Sociology |
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| J | Political Science |
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| K | Law |
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| K | Law (General) |
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| KD | Law of the United Kingdom and Ireland |
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| KDZ, KG - KH | Law of the Americas, Latin America and the West Indies |
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| KE | Law of Canada |
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| KF | Law of the United States |
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| KJ - KKZ | Law of Europe |
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| KJV - KJW | Law of France |
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| KK - KKC | Law of Germany |
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| L | Education |
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| M | Music and Books on Music |
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| N | Fine Arts |
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| P | Language and Literature |
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| P | General Philology and Linguistics |
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| PA | Classical Languages and Literatures |
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| PB - PH | Modern European Languages |
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| PG | Russian Literature |
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| PJ | Oriental Philology and Literature |
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| PK | Indo-Iranian Philology and Literature |
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| PL - PM | Languages of Eastern Asia, Africa, Oceania, Hyperborean, Indian, and Artificial Languages |
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| PN, PR - PS, PZ | General Literature, English and American Literature, Fiction in English, Juvenile belles lettres |
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| PQ | Romance Literatures |
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| PT | Germanic Literatures |
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| Q | Science |
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| R | Medicine |
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| S | Agriculture |
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| T | Technology |
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| U | Military Science |
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| V | Naval Science |
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| Z | Bibliography, Library Science |
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