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In the table below, the first letter (bold) represents the broad subject of the material, followed by some common sub-classifications. There are other far more specific classifications, but these represent the ones you'll most likely see in our library.
| A | GENERAL WORKS |
| AE | Encyclopedias |
| AG | Dictionaries and other general reference works |
| AY | Yearbooks, Almanacs, Directories |
| B | PHILOSOPHY. PSYCHOLOGY. RELIGION |
| BF | Psychology |
| BM | Judaism |
| BP | Islam |
| BR | Christianity |
| BS | The Bible |
| C | AUXILIARY SCIENCE OF HISTORY |
| CB | History of Civilization |
| CS | Genealogy |
| CT | Biography |
| D | HISTORY: General, Europe, Asia, Africa |
| DA | Great Britain |
| DC | France |
| DD | Germany |
| DG | Italy |
| DS | Asia |
| DT | Africa |
| E-F | HISTORY: America and United States |
| E | America (general) and United States |
| F1-F975 | United States (local history) |
| F1001-F1140 | Canada |
| F1201-F1392 | Mexico |
| F1401-F3799 | Central and South America, Caribbean |
| G | GEOGRAPHY |
| GC | Oceanography |
| GN | Anthropology, Ethnology |
| GT | Manners and Customs |
| H | SOCIAL SCIENCES |
| HB | Economics |
| HM-HN | Sociology |
| HQ | Family, Marriage, Home |
| HV | Social Problems |
| J | POLITICAL SCIENCE |
| JK | Constitutional History and Administration |
| JS | Local Government |
| JX | International Law, International Relations |
| K | LAW |
| KF | Law: United States |
| KFO | Law: Ohio |
| L | EDUCATION |
| LA | History of Education |
| LB | Teaching |
| M | MUSIC |
| ML | Literature of Music |
| MT | Music Instruction and Study |
| N | FINE ARTS |
| NA | Architecture |
| NC | Graphic Arts (Drawing, Design, Illustration) |
| NE | Print Media |
| P | LANGUAGE & LITERATURE |
| PE | English Language |
| PL | Japanese Literature |
| PS | American Literature |
| PZ | Children's Literature |
| Q | SCIENCE & MATHEMATICS |
| QA | Mathematics, Computer Science |
| QB | Astronomy |
| QC | Physics |
| QD | Chemistry |
| QE | Geology |
| QH | Biology |
| R | MEDICINE |
| RC | Internal Medicine |
| RD | Surgery |
| RG | Gynecology & Obstetrics |
| RJ | Pediatrics |
| RM | Therapeutics. Pharmacology |
| RT | Nursing |
| S | AGRICULTURE |
| SB | Plant Culture |
| SD | Forestry |
| SF | Animal Culture |
| T | TECHNOLOGY |
| TA | Engineering |
| TK | Electrical Engineering. Electronics. Nuclear Engineering |
| TR | Photography |
| U-V | MILITARY SCIENCE. NAVAL SCIENCE |
| Z | HISTORY OF BOOKS. LIBRARY SCIENCE, BIBLIOGRAPHY |