Subject Guide Conversion table
| AE | Encyclopedias |
| AL | Indexes |
| AY | Almanacs |
| BF | Psychology |
| BJ | Ethics |
| BM | Judaism |
| BP | Islam |
| BR | Christianity |
| CB | Civilization & Culture |
| CS | Genealogy |
| CT | Biography (General) |
| D | History (General) |
| DA | Great Britain |
| DE | Classical Antiquity |
| DS | History of Asia |
| DT - DX | History of Africa, Australia, New Zealand, etc |
| E - F | History: America (Western Hemisphere) |
| GB | Physical Geography |
| GN | Anthropology |
| GT | Manners and Customs |
| GV | Recreation (Sports, Dance) |
| HA | Statistics |
| HB- HD | Economics |
| HE | Transportation |
| HG - HJ | Finance |
| HM | Sociology |
| HQ | Family, Marriage, Sexual Life |
| HV | Social/Public Welfare, Alcoholism, Drug Abuse, Criminology, Penology |
| J | Political Science |
| K | Law (General) |
| LA | History of Education |
| LB | Theory and Practice |
| ML | Literature of Music |
| MT | Music Instruction and Study |
| NA | Architecture |
| ND | Painting |
| PE | English Language |
| PN | Criticisms, Poetry, Prose, Journalism |
| QA | Mathematics |
| QC | Physics |
| QD | Chemistry |
| QH | General Biology |
| QM | Human Anatomy |
| QP | Physiology |
| RG | Gynecology and Obstetrics |
| RS | Pharmacy |
| RT | Nursing |
| S | Agriculture |
| T | Technology |
| U | Military Science |
| V | Naval Science |
| Z | Bibliography, Library Science |
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