D
- Library of Congress Classification/Class D -- General History
- Library of Congress Classification/Class D, subclass DA -- History of Great Britain
- Library of Congress Classification/Class D, subclass DB -- History of Austria, Liechtenstein, Hungary, and Czechoslovakia
- Library of Congress Classification/Class D, subclass DC -- History of France, Andorra, and Monaco
- Library of Congress Classification/Class D, subclass DD -- History of Germany
- Library of Congress Classification/Class D, subclass DF -- History of Greece
- Library of Congress Classification/Class D, subclass DG -- History of Italy and Malta
- Library of Congress Classification/Class D, subclass DH -- History of the Low Countries and Benelux
- Library of Congress Classification/Class D, subclass DJ -- History of the Netherlands
- Library of Congress Classification/Class D, subclass DL -- History of Northern Europe and Scandinavia
- Library of Congress Classification/Class D, subclass DP -- History of Spain and Portugal
- Library of Congress Classification/Class D, subclass DQ -- History of Switzerland
- Library of Congress Classification/Class D, subclass DR -- History of the Balkan Peninsula
- Library of Congress Classification/Class D, subclass DS -- History of Asia
- Library of Congress Classification/Class D, subclass DT -- History of Africa
- Library of Congress Classification/Class D, subclass DU -- History of Oceania
G
H
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H cont.
- Library of Congress Classification/Class H, subclass HE -- Transportation and Communications
- Library of Congress Classification/Class H, subclass HF -- Commerce
- Library of Congress Classification/Class H, subclass HG -- Finance
- Library of Congress Classification/Class H, subclass HJ -- Public Finance
- Library of Congress Classification/Class H, subclass HM -- Sociology (General)
- Library of Congress Classification/Class H, subclass HQ -- Family, Marriage, Woman, and Sexuality
- Library of Congress Classification/Class H, subclass HS -- Societies
- Library of Congress Classification/Class H, subclass HT -- Communities, Classes, and Races
- Library of Congress Classification/Class H, subclass HV -- Social Pathology, Social and Public Welfare, and Criminology
L
- Library of Congress Classification/Class B, subclass B -- Philosophy (General)
- Library of Congress Classification/Class B, subclass BD -- Speculative philosophy
- Library of Congress Classification/Class B, subclass BF -- Psychology
- Library of Congress Classification/Class B, subclass BJ -- Ethics
- Library of Congress Classification/Class B, subclass BL -- Religions. Mythology. Rationalism
- Library of Congress Classification/Class B, subclass BM -- Judaism
- Library of Congress Classification/Class B, subclass BP -- Islam. Bahá'ísm. Theosophy
- Library of Congress Classification/Class B, subclass BQ -- Buddhism
- Library of Congress Classification/Class B, subclass BR -- Christianity
- Library of Congress Classification/Class B, subclass BS -- The Bible
- Library of Congress Classification/Class B, subclass BT -- Doctrinal Theology
- Library of Congress Classification/Class B, subclass BV -- Practical Theology
- Library of Congress Classification/Class B, subclass BX -- Christian Denominations
- Library of Congress Classification/Class D, subclass DK -- History of Russia, The Soviet Union, Former Soviet Republics, and Poland
- Library of Congress Classification/Class Q, subclass QR -- Microbiology
P
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P cont.
- Library of Congress Classification/Class P, subclass PC -- Romanic languages
- Library of Congress Classification/Class P, subclass PD -- Germanic languages
- Library of Congress Classification/Class P, subclass PE -- English language
- Library of Congress Classification/Class P, subclass PF -- West Germanic languages
- Library of Congress Classification/Class P, subclass PG -- Slavic, Baltic and Albanian languages
- Library of Congress Classification/Class P, subclass PH -- Uralic and Basque languages
- Library of Congress Classification/Class P, subclass PJ -- Oriental philology and literature
- Library of Congress Classification/Class P, subclass PM -- Hyperborean, Indian and artificial languages
- Library of Congress Classification/Class P, subclass PN -- General Literature
- Library of Congress Classification/Class P, subclass PR -- English literature
- Library of Congress Classification/Class P, subclass PS -- American Literature
- Library of Congress Classification/Class P, subclass PT -- Germanic literature
- Library of Congress Classification/Class P, subclass PZ -- Fiction and juvenile belles lettres
Q
- Library of Congress Classification/Class Q, subclass Q -- Science (General)
- Library of Congress Classification/Class Q, subclass QA -- Mathematics
- Library of Congress Classification/Class Q, subclass QB -- Astronomy
- Library of Congress Classification/Class Q, subclass QC -- Physics
- Library of Congress Classification/Class Q, subclass QD -- Chemistry
- Library of Congress Classification/Class Q, subclass QE -- Geology
- Library of Congress Classification/Class Q, subclass QH -- Natural history - Biology
- Library of Congress Classification/Class Q, subclass QK -- Botany
- Library of Congress Classification/Class Q, subclass QL -- Zoology
- Library of Congress Classification/Class Q, subclass QM -- Human anatomy
- Library of Congress Classification/Class Q, subclass QP -- Physiology
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