| A -- GENERAL WORKS | |
| A | COLLECTIONS. SERIES. COLLECTED WORKS |
| AE | ENCYCLOPEDIAS |
| AG | DICTIONARIES. GENERAL REFERENCE WORKS |
| AI | INDEXES |
| AM | MUSEUMS. COLLECTORS AND COLLECTING |
| AN | NEWSPAPERS |
| AP | PERIODICALS |
| AS | ACADEMIES AND LEARNED SOCIETIES |
| AY | YEARBOOKS. ALMANACS. DIRECTORIES |
| AZ | HISTORY OF SCHOLARSHIPS AND LEARNING |
| B -- PHILOSOPHY. PSYCHOLOGY. RELIGION | |
| B | PHILOSOPHY |
| BC | LOGIC |
| BD | METAPHYSICS. EPISTEMOLOGY |
| BF | PSYCHOLOGY |
| BH | AESTHETICS |
| BJ | ETHICS |
| BL | RELIGIONS. MYTHOLOGY |
| BM | JUDAISM |
| BP | ISLAM. OTHER BELIEFS AND MOVEMENTS |
| BQ | BUDDHISM |
| BR | CHRISTIANITY |
| BS | BIBLE |
| BT | DOCTRINAL THEOLOGY |
| BV | PRACTICAL THEOLOGY |
| BX | CHRISTIAN DENOMINATIONS |
| C -- AUXILIARY SCIENCES OF HISTORY | |
| C | AUXILIARY SCIENCES OF HISTORY (GENERAL) |
| CB | HISTORY OF CIVILIZATION |
| CC | ARCHAEOLOGY |
| CD | DIPLOMATICS. ARCHIVES. SEALS |
| CE | TECHNICAL CHRONOLOGY. CALENDAR |
| CJ | NUMISMATICS |
| CN | INSCRIPTIONS. EPIGRAPHY |
| CR | HERALDRY |
| CS | GENEALOGY |
| CT | BIOGRAPHY |
| D -- HISTORY (GENERAL AND OLD WORLD) | |
| D | HISTORY (GENERAL) |
| DA | GREAT BRITAIN |
| DAW | CENTRAL EUROPE |
| DB | AUSTRIA |
| DC | FRANCE |
| DD | GERMANY |
| DE | MEDITERRANEAN REGION |
| DF | GREECE |
| DG | ITALY |
| DH | BELGIUM. LUXEMBURG |
| DJ | HOLLAND |
| DJK | EASTERN EUROPE |
| DK | RUSSIA. FORMER SOVIET REPUBLICS |
| DL | NORTHERN EUROPE. SCANDINAVIA |
| DP | SPAIN. PORTUGAL |
| DQ | SWITZERLAND |
| DR | BALKAN PENINSULA. TURKEY |
| DS | ASIA. ARAB COUNTRIES |
| DT | AFRICA |
| DU | AUSTRALIA. NEW ZEALAND. OCEANIA (SOUTH SEAS) |
| DX | GYPSIES |
| E-F -- HISTORY (AMERICA) | |
| E | AMERICA |
| F | UNITED STATES LOCAL HISTORY |
| G -- GEOGRAPHY. ANTHROPOLGY. RECREATION | |
| G | GEOGRAPHY (GENERAL). ATLASES. MAPS |
| GA | MATHEMATICAL GEOGRAPHY. CARTOGRAPHY |
| GB | PHYSICAL GEOGRAPHY |
| GC | OCEANOGRAPHY |
| GE | ENVIRONMENTAL SCIENCES |
| GF | HUMAN ECOLOGY. ANTHROPOGEOGRAPHY |
| GN | ANTHROPOLOGY |
| GR | FOLKLORE |
| GT | MANNERS AND CUSTOMS (GENERAL) |
| GV | RECREATION. LEISURE |
| H -- SOCIAL SCIENCES | |
| H | SOCIAL SCIENCES (GENERAL) |
| HA | STATISTICS |
| HB | ECONOMIC THEORY. DEMOGRAPHY. BUSINESS CYCLES |
| HC-HD | ECONOMIC HISTORY AND CONDITIONS |
| HE | TRANSPORTATION AND COMMUNICATIONS |
| HF | COMMMERCE |
| HG | FINANCE |
| HJ | PUBLIC FINANCE |
| HM | SOCIOLOGY (GENERAL) |
| HN | SOCIAL HISTORY AND CONDITIONS. SOCIAL PROBLEMS |
| HQ | FAMILY. MARRIAGE. WOMEN |
| HS | SOCIETIES. CLUBS |
| HT | URBANIZATION. COMMUNITIES. RACES |
| HV | SOCIAL SERVICE. PUBLIC WELFARE. CRIMINOLOGY |
| HX | SOCIALISM. COMMUNISM. |
| J -- POLITICAL SCIENCE | |
| J | GENERAL LEGISLATIVE AND EXECUTIVE PAPERS |
| JA | POLITICAL SCIENCE (GENERAL) |
| JC | POLITICAL THEORY |
| JF-JQ | POLITICAL INSTITUTIONS AND PUBLIC ADMINISTRATION |
| JS | LOCAL GOVERNMENT. MUNICIPAL GOVERNMENT |
| JV | COLONIES AND COLONIZATION. EMIGRATION AND IMMIGRATION |
| JX | INTERNATIONAL LAW |
| JZ | INTERNATIONAL RELATIONS |
| K -- LAW | |
| K | LAW (GENERAL). LAW OF TURKEY |
| KD | UNITED KINGDOM AND IRELAND |
| KDZ | NORTH AMERICA |
| KE | LAW OF CANADA |
| KF | UNITED STATES |
| KG | LATIN AMERICA |
| KH | SOUTH AMERICA |
| KJ | EUROPE |
| KL-KW | ASIA. EUROASIA. AFRICA. PACIFIC AREA. ANTARCTICA |
| KZ | LAW OF NATIONS. LAW OF THE SEA. SPACE LAW |
| L -- EDUCATION | |
| L | EDUCATION (GENERAL) |
| LA | HISTORY OF EDUCATION |
| LB | THEORY AND PRACTICE OF EDUCATION |
| LC | SPECIAL ASPECTS OF EDUCATION |
| LD-LG | INDIVIDUAL INSTITUTIONS |
| LH | COLLEGE AND SCHOOL MAGAZINES AND PAPERS |
| LJ | STUDENT FRATERNITIES AND SOCIETIES |
| LT | TEXTBOOKS |
| M -- MUSIC | |
| M | MUSIC |
| ML | LITERATURE ON MUSIC |
| MT | MUSICAL INSTRUCTION AND STUDY |
| N -- FINE ARTS | |
| N | VISUAL ARTS |
| NA | ARCHITECTURE |
| NB | SCULPTURE |
| NC | DRAWING. DESIGN. ILLUSTRATION |
| ND | PAINTING |
| NE | PRINTMAKING AND ENGRAVING |
| NK | DECORATIVE ARTS |
| NX | ARTS CENTERS AND FACILITIES |
| P -- LANGUAGE AND LITERATURE | |
| P | PHILOLOGY. LINGUISTICS |
| PA | GREEKROMANLATIN LITERATURE |
| PB | CELTIC LANGUAGES. |
| PC | ROMANIC |
| PD | GERMANIC |
| PE | ENGLISH |
| PF | GERMANIC |
| PG | SLAVIC. BALTIC. ALBANIAN |
| PH | URALIC. BASQUE |
| PJ | ORIENTAL PHILOLOGY AND LITERATURE |
| PK | INDO-IRANIAN PHILOLOGY AND LITERATURE |
| PL | EASTERN ASIA AFRICA OCEANIA LANGUAGES AND LITERATURES |
| PM | HYPERBOREAN INDIAN AND ARTIFICIAL LANGUAGES |
| PN | LITERATURE (GENERAL) |
| PQ | FRENCH ITALIAN SPANISHLITERATURE |
| PR | ENGLISH LITERATURE |
| PS | AMERICAN LITERATURE |
| PT | GERMAN DUTCH SCANDINAVIAN LITERATURE |
| PZ | FICTION AND JUVENILE BELLES LETTRES |
| Q -- SCIENCE | |
| Q | SCIENCE |
| QA | MATHEMATICS |
| QB | ASTRONOMY |
| QC | PHYSICS |
| QD | CHEMISTRY |
| QE | GEOLOGY |
| QH | BIOLOGY. ECOLOGY. |
| QK | BOTANY |
| QL | ZOOLOGY |
| QM | HUMAN ANATOMY |
| QP | PHYSIOLOGY |
| QR | MICROBIOLOGY |
| R -- MEDICINE | |
| R | MEDICINE (GENERAL) |
| RA | PUBLIC ASPECTS OF MEDICINE |
| RB | PATHOLOGY |
| RC | INTERNAL MEDICINE. SPORTS MEDICINE |
| RD | SURGERY |
| RE | OPHTHALMOLOGY |
| RF | OTORHINOLARYNGOLOGY |
| RG | GYNECOLOGY AND OBSTETRICS |
| RJ | PEDIATRICS |
| RK | DENTISTRY |
| RL | DERMATOLOGY |
| RM | THERAPEUTICS. PHARMACOLOGY |
| RS | PHARMACY AND MATERIA MEDICA |
| RT | NURSING |
| RV | BOTANIC THOMSONIAN AND ECLECTIC MEDICINE |
| RX | HOMEOPATHY |
| RZ | OTHER SYSTEMS OF MEDICINE |
| S -- AGRICULTURE | |
| S | AGRICULTURE (GENERAL) |
| SB | PLANT CULTURE |
| SD | FORESTRY |
| SF | ANIMAL CULTURE |
| SH | AQUACULTURE. FISHERIES. ANGLING |
| SK | HUNTING SPORTS |
| T -- TECHNOLOGY | |
| T | TECHNOLOGY (GENERAL) |
| TA | ENGINEERING (GENERAL). CIVIL ENGINEERING (GENERAL) |
| TC | HYDRAULIC ENGINEERING. OCEAN ENGINEERING |
| TD | ENVIRONMENTAL TECHNOLOGY. SANITARY ENGINEERING |
| TE | HIGHWAY ENGINEERING |
| TF | RAILROAD ENGINEERING |
| TG | BRIDGE ENGINEERING |
| TH | BUILDING CONSTRUCTION |
| TJ | MECHANICAL ENGINEERING |
| TK | ELECTRICAL ENGINEERING. NUCLEAR ENGINEERING |
| TL | MOTOR VEHICLES. AERONAUTICS. ASTRONAUTICS |
| TN | MINING ENGINEERING. METALLURGY |
| TP | CHEMICAL TECHNOLOGY |
| TR | PHOTOGRAPHY |
| TS | MANUFACTURES |
| TT | HANDICRAFTS. ARTS AND CRAFTS |
| TX | HOME ECONOMICS |
| U -- MILITARY SCIENCE | |
| U | MILITARY SCIENCE (GENERAL) |
| UA | ARMIES. ORGANIZATION. DISTRIBUTION |
| UB | MILITARY ADMINISTRATION |
| UC | MAINTENANCE NAD TRANSPORTATION |
| UD | INFANTRY |
| UE | CAVALRY. ARMOR |
| UF | ARTILLERY |
| UG | MILITARY ENGINEERING |
| UH | OTHER SERVICES |
| V -- NAVAL SCIENCE | |
| V | NAVAL SCIENCE |
| VA | NAVIES. ORGANIZATION. DISTRIBUTION |
| VB | NAVAL ADMINISTRATION |
| VC | NAVAL MAINTENANCE |
| VD | NAVAL SEAMEN |
| VE | MARINES |
| VF | NAVAL ORDNANCE |
| VG | MINOR SERVICES OF NAVIES |
| VK | NAVIGATION. MERCHANT MARINE |
| VM | NAVAL ARCHITECTURE. SHIPBUILDING. MARINE ENGINEERING |
| Z -- LIBRARY SCIENCE | |
| Z | BOOKS(GENERAL). WRITING. PALEOGRAPHY |
| ZA | INFORMATION RESOURCES (GENERAL) |