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Effective April 2003
Note: Due to a search limitation in LUIS, LC classifications can only be searched in a very general manner - letters - or very specifically. To search PL 2 will locate only PL 2, not PL 2 - PL 2999.
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| Class | General Subject | Specific Subject | Titles |
| 01x | General Works | Bibliographical Science | 252 |
| 02x | General Works | Library Science | 38 |
| 03x | General Works | General Encyclopedias | 15 |
| 04x | General Works | General Collected Essays | 1 |
| 05x | General Works | General Periodicals | 157 |
| 06x | General Works | General Societies, Museums | 6 |
| 07x | General Works | Journalism | 29 |
| 08x | General Works | Collected Works | 17 |
| 09x | General Works | Book Rarities | 79 |
| 10x | Philosophy | Philosophy, Esthetics | 14 |
| 11x | Philosophy | Metaphysics | 10 |
| 12x | Philosophy | Metaphysical Theories | 26 |
| 13x | Philosophy | Pseudopsychology | 54 |
| 14x | Philosophy | Specific Philosophical Viewpoints | 12 |
| 15x | Philosophy | Psychology | 21 |
| 16x | Philosophy | Logic | 9 |
| 17x | Philosophy | Ethics | 162 |
| 18x | Philosophy | Oriental and Ancient Philosophy | 21 |
| 19x | Philosophy | Modern Philosophy | 119 |
| 20x | Religion | Religion | 84 |
| 21x | Religion | Natural Religion | 91 |
| 22x | Religion | Bible | 281 |
| 23x | Religion | Systematic or Doctrinal Theology | 381 |
| 24x | Religion | Devotional Theology | 196 |
| 25x | Religion | Pastoral Theology | 345 |
| 26x | Religion | Ecclesiastical Theology | 213 |
| 27x | Religion | Christian Church History | 199 |
| 28x | Religion | Christian Churches and Sects | 411 |
| 29x | Religion | Non-Christian Religions | 76 |
| 30x | Social Sciences | Social Sciences, Sociology | 96 |
| 31x | Social Sciences | Statistics | 12 |
| 32x | Social Sciences | Political Science | 834 |
| 33x | Social Sciences | Economics | 260 |
| 34x | Social Sciences | Law | 143 |
| 35x | Social Sciences | Public Administration | 71 |
| 36x | Social Sciences | Social Welfare | 34 |
| 37x | Social Sciences | Education | 78 |
| 38x | Social Sciences | Commerce | 40 |
| 39x | Social Sciences | Customs | 123 |
| 40x | Linguistics | Linguistics | 8 |
| 41x | Linguistics | Comparative Linguistics | 8 |
| 42x | Linguistics | English Language | 49 |
| 43x | Linguistics | German, Germanic Languages | 2 |
| 44x | Linguistics | French, Provencal | 17 |
| 45x | Linguistics | Italian, Rumanian | 9 |
| 46x | Linguistics | Spanish, Portuguese | 10 |
| 47x | Linguistics | Latin, Other Italic | 24 |
| 48x | Linguistics | Greek, Hellenic Group | 16 |
| 49x | Linguistics | Other Languages | 33 |
| 50x | Pure Sciences | Pure Science | 43 |
| 51x | Pure Sciences | Mathematics | 43 |
| 52x | Pure Sciences | Astronomy | 46 |
| 53x | Pure Sciences | Physics | 26 |
| 54x | Pure Sciences | Chemistry, Crystallography, Mineralogy | 20 |
| 55x | Pure Sciences | Earth Sciences | 16 |
| 56x | Pure Sciences | Paleontology | 8 |
| 57x | Pure Sciences | Biological Sciences | 68 |
| 58x | Pure Sciences | Botany | 72 |
| 59x | Pure Sciences | Zoology | 92 |
| 60x | Applied Science | Applied Science | 5 |
| 61x | Applied Science | Medical Sciences | 101 |
| 62x | Applied Science | Engineering | 34 |
| 63x | Applied Science | Agriculture | 77 |
| 64x | Applied Science | Home Economics | 12 |
| 655x | Applied Science | Graphic Arts Industries | 157 |
| 65x | Applied Science | Business and Business Methods (except graphic arts) | 47 |
| 66x | Applied Science | Chemical Technology, Industrial Chemistry | 1 |
| 67x | Applied Science | Manufactures, Continued | 11 |
| 68x | Applied Science | Manufactures, Continued | 14 |
| 69x | Applied Science | Building Construction | 6 |
| 70x | Arts & Recreation | Arts and Recreation | 94 |
| 71x | Arts & Recreation | Landscape Architecture | 27 |
| 72x | Arts & Recreation | Architecture | 302 |
| 73x | Arts & Recreation | Sculpture | 50 |
| 74x | Arts & Recreation | Drawing, Decorative Art | 154 |
| 75x | Arts & Recreation | Painting | 119 |
| 76x | Arts & Recreation | Prints and Printmaking | 105 |
| 77x | Arts & Recreation | Photography | 7 |
| 78x | Arts & Recreation | Music | 80 |
| 79x | Arts & Recreation | Recreation | 161 |
| 80x | Literature | Literature | 252 |
| 81x | Literature | American Literature | 3356 |
| 82x | Literature | English Literature | 6180 |
| 83x | Literature | German and Other Germanic Literatures | 238 |
| 84x | Literature | French, Provencal, Catalan Literatures | 700 |
| 85x | Literature | Italian, Rumanian, Romansch Literatures | 316 |
| 86x | Literature | Spanish and Portuguese Literatures | 130 |
| 87x | Literature | Latin and Other Italic Literatures | 436 |
| 88x | Literature | Greek and Hellenic Group Literatures | 205 |
| 89x | Literature | Literature of Other Languages | 138 |
| 90x | History | History | 75 |
| 91x | History | Geography | 671 |
| 92x | History | Biography | 125 |
| 93x | History | Ancient World History | 47 |
| 94x | History | European History | 1036 |
| 95x | History | Asian History | 26 |
| 96x | History | African History | 23 |
| 97x | History | North American History | 544 |
| 98x | History | South American History | 97 |
| 99x | History | Oceanian History | 18 |
Back to Rare Books.
| AC | General Works | Collections. Series. Collected Works | 15 |
| AE | General Works | Encyclopedias (General) | 11 |
| AG | General Works | Dictionaries. General Reference Works | 8 |
| AI | General Works | Indexes (General) | 0 |
| AM | General Works | Museums (General). Collectors and collecting | 2 |
| AN | General Works | Newspapers | 0 |
| AP | General Works | Periodicals (General) | 31 |
| AS | General Works | Academies and learned societies (General) | 5 |
| AY | General Works | Yearbooks. Almanacs. Directories | 7 |
| AZ | General Works | History of scholarship and learning | 1 |
| B | Philosophy. Psychology. Religion | Philosophy (General) | 92 |
| BC | Philosophy. Psychology. Religion | Logic | 3 |
| BD | Philosophy. Psychology. Religion | Speculative philosophy | 12 |
| BF | Philosophy. Psychology. Religion | Psychology | 40 |
| BH | Philosophy. Psychology. Religion | Aesthetics | 2 |
| BJ | Philosophy. Psychology. Religion | Ethics | 80 |
| BL | Philosophy. Psychology. Religion | Religions. Mythology. Rationalism | 46 |
| BM | Philosophy. Psychology. Religion | Judaism | 315 |
| BP | Philosophy. Psychology. Religion | Islam. Bahaism. Theosophy | 4 |
| BQ | Philosophy. Psychology. Religion | Buddhism | 1 |
| BR | Philosophy. Psychology. Religion | Christianity (General) | 45 |
| BS | Philosophy. Psychology. Religion | The Bible and exegesis | 188 |
| BT | Philosophy. Psychology. Religion | Doctrinal theology. Apologetics | 91 |
| BV | Philosophy. Psychology. Religion | Practical theology | 157 |
| BX | Philosophy. Psychology. Religion | Denominations and sects | 359 |
| C | Auxiliary Sciences of History | Auxiliary sciences of history (General) | 0 |
| CB | Auxiliary Sciences of History | History of civilization | 7 |
| CC | Auxiliary Sciences of History | Archaeology (General) | 0 |
| CD | Auxiliary Sciences of History | Diplomatics. Archives. Seals | 12 |
| CE | Auxiliary Sciences of History | Technical chronology. Calendar | 5 |
| CJ | Auxiliary Sciences of History | Numismatics | 4 |
| CN | Auxiliary Sciences of History | Inscriptions. Epigraphy | 46 |
| CR | Auxiliary Sciences of History | Heraldry | 14 |
| CS | Auxiliary Sciences of History | Genealogy | 12 |
| CT | Auxiliary Sciences of History | Biography | 33 |
| D | History: General and Old World | History (General) | 1069 |
| DA | History: General and Old World | Great Britain | 227 |
| DAW | History: General and Old World | Central Europe | 0 |
| DB | History: General and Old World | Austria. Czechoslovakia. Hungary | 10 |
| DC | History: General and Old World | France | 93 |
| DD | History: General and Old World | Germany | 57 |
| DE | History: General and Old World | The Mediterranean region. Greco-Roman world | 62 |
| DF | History: General and Old World | Greece | 12 |
| DG | History: General and Old World | Italy | 50 |
| DH-DJ | History: General and Old World | Netherlands. Belgium. Luxemburg | 9 |
| DJK | History: General and Old World | Eastern Europe | 0 |
| DK | History: General and Old World | Russia. Poland. Finland | 10 |
| DL | History: General and Old World | Northern Europe. Scandinavia | 7 |
| DP | History: General and Old World | Spain. Portugal | 28 |
| DQ | History: General and Old World | Switzerland | 3 |
| DR | History: General and Old World | Eastern Europe. Balkan Peninsula. Turkey | 2 |
| DS | History: General and Old World | Asia | 180 |
| DT | History: General and Old World | Africa | 98 |
| DU | History: General and Old World | Oceania (South Seas) | 176 |
| DX | History: General and Old World | Gypsies | 0 |
| E | History: America | American History (General) | 421 |
| F | History: America | America (Specific) | 341 |
| G | Geography. Anthropology. Recreation | Geography (General) | 51 |
| GA | Geography. Anthropology. Recreation | Mathematical geography. Cartography | 7 |
| GB | Geography. Anthropology. Recreation | Physical geography | 1 |
| GC | Geography. Anthropology. Recreation | Oceanography | 5 |
| GE | Geography. Anthropology. Recreation | Environmental Sciences | 0 |
| GF | Geography. Anthropology. Recreation | Human ecology. Anthropogeography | 0 |
| GN | Geography. Anthropology. Recreation | Anthropology | 24 |
| GR | Geography. Anthropology. Recreation | Folklore | 25 |
| GT | Geography. Anthropology. Recreation | Manners and customs (General) | 13 |
| GV | Geography. Anthropology. Recreation | Recreation | 379 |
| H | Social Sciences | Social sciences (General) | 5 |
| HA | Social Sciences | Statistics | 3 |
| HB | Social Sciences | Economics | 11 |
| HC | Social Sciences | Economic history & conditions. National prod. | 15 |
| HD | Social Sciences | Land. Agriculture. Industry | 69 |
| HE | Social Sciences | Transportation and communication | 12 |
| HF | Social Sciences | Commerce | 39 |
| HG | Social Sciences | Finance | 14 |
| HJ | Social Sciences | Public Finance | 7 |
| HM | Social Sciences | Sociology | 8 |
| HN | Social Sciences | Social History. Conditions. Problems. Reform | 8 |
| HQ | Social Sciences | The Family. Marriage. Woman | 31 |
| HS | Social Sciences | Societies: Secret, Benevolent, etc. | 5 |
| HT | Social Sciences | Communities. Classes. Races | 17 |
| HV | Social Sciences | Social Pathology. Social & Public Welfare. Criminology | 68 |
| HX | Social Sciences | Socialism. Communism. Anarchism | 18 |
| J | Political Science | Official Documents | 6 |
| JA | Political Science | Collections and General Works | 2 |
| JC | Political Science | Political Theory | 15 |
| JF | Political Science | Political Institutions & Public Administration | 0 |
| JK | Political Science | United States | 6 |
| JL | Political Science | British America. Latin America | 9 |
| JN | Political Science | Europe | 7 |
| JQ | Political Science | Asia. Africa. Australia. Oceania | 0 |
| JS | Political Science | Local Government | 1 |
| JV | Political Science | Colonies and Colonization | 6 |
| JX | Political Science | International Law. International Relations | 10 |
| K | Law | Law (General ) | 1 |
| KD | Law | Law of England and Wales | 15 |
| KDC | Law | Law of Scotland | 1 |
| KDE | Law | Law of Northern Ireland | 0 |
| KDG | Law | Law of Isle of Man and the Channel Islands | 0 |
| KDK | Law | Law of Ireland (Eire) | 0 |
| KDZ | Law | North America | 0 |
| KE | Law | Federal Law (Canada) | 0 |
| KEA - KEY | Law | Law of Individual Provinces and Territories (Canada) | 0 |
| KEZ | Law | Law of Individual Cities, A-Z (Canada) | 0 |
| KF | Law | Federal Law. Common and Collective State Law | 25 |
| KFW | Law | Washington | 0 |
| KFX | Law | Law of Individual Cities, A-Z | 0 |
| KFZ | Law | Law of Individual Territories | 0 |
| KG | Law | Latin America | 7 |
| KGA - KGH | Law | Mexico & Cental America | 0 |
| KGJ | Law | West Indies | 0 |
| KGK - KGZ | Law | Caribbean Area | 0 |
| KH | Law | South America (General) | 1 |
| KHA | Law | Argentina | 1 |
| KHB - KHW | Law | South America. Individual Countries | 0 |
| KJ - KKZ | Law | 0 | |
| KK | Law | Law of Germany | 3 |
| KKB | Law | German States, Provinces, Territories, etc. | 2 |
| KL | Law | History of Law | 0 |
| KLA - KWX | Law | 0 | |
| L | Education | Education (General) | 2 |
| LA | Education | History of Education | 12 |
| LB | Education | Theory and Practice of Education | 10 |
| LC | Education | Special Aspects of Education | 18 |
| LD | Education | United States | 1 |
| LE | Education | America, except United States | 1 |
| LF | Education | Europe | 7 |
| LG | Education | Asia. Africa. Oceania | 0 |
| LH | Education | College and School Magazines and Papers | 2 |
| LJ | Education | Student Fraternities and Sororities, United States | 0 |
| LT | Education | Textbooks | 0 |
| M | Music | Music | 31 |
| ML | Music | Literature on Music | 75 |
| MT | Music | Music Instruction and Study | 2 |
| N | Fine Arts | Visual Arts (General) | 225 |
| NA | Fine Arts | Architecture | 135 |
| NB | Fine Arts | Sculpture | 30 |
| NC | Fine Arts | Drawing. Design. Illustration | 62 |
| ND | Fine Arts | Painting | 169 |
| NE | Fine Arts | Print Media | 71 |
| NK | Fine Arts | Decorative Arts. Applied Arts | 32 |
| NX | Fine Arts | Arts in General | 18 |
| P | Language and Literature | Philology and Linguistics (General) | 11 |
| PA | Language and Literature | Classical Languages and Literature | 245 |
| PB | Language and Literature | General Works | 9 |
| PC | Language and Literature | Romance Languages | 11 |
| PD | Language and Literature | Germanic Languages | 0 |
| PE | Language and Literature | English | 30 |
| PF | Language and Literature | West Germanic | 7 |
| PG | Language and Literature | Slavic | 57 |
| PH | Language and Literature | Finno-Ugrian, Basque Languages and Literature | 5 |
| PJ | Language and Literature | General Works. Oriental Philology & Literature | 108 |
| PK | Language and Literature | Indo-Iranian Philology & Literature | 11 |
| PL | Language and Literature | Languages and Literatures of Eastern Asia | 88 |
| PM | Language and Literature | American Indian Languages | 3 |
| PN | Language and Literature | Literary History and Collections (General) | 322 |
| PQ | Language and Literature | Romance Literatures | 2415 |
| PR | Language and Literature | English Literature | 3314 |
| PS | Language and Literature | American Literature | 4645 |
| PT | Language and Literature | Germanic Literature | 353 |
| PZ | Language and Literature | Fiction and Juvenile Belles Lettres | 90 |
| Q | Science | Science (General) | 140 |
| QA | Science | Mathematics | 31 |
| QB | Science | Astronomy | 40 |
| QC | Science | Physics | 27 |
| QD | Science | Chemistry | 20 |
| QE | Science | Geology | 11 |
| QH | Science | Natural History (General) Biology (General) | 44 |
| QK | Science | Botany | 89 |
| QL | Science | Zoology | 126 |
| QM | Science | Human Anatomy | 7 |
| QP | Science | Physiology | 14 |
| QR | Science | Microbiology | 0 |
| R | Medicine | Medicine (General) | 48 |
| RA | Medicine | Public Aspects of Medicine | 15 |
| RB | Medicine | Pathology | 0 |
| RC | Medicine | Internal Medicine | 31 |
| RD | Medicine | Surgery | 6 |
| RE | Medicine | Ophthalmology | 0 |
| RF | Medicine | Otorhinolaryngology | 1 |
| RG | Medicine | Gynecology and Obstetrics | 7 |
| RJ | Medicine | Pediatrics | 3 |
| RK | Medicine | Dentistry | 1 |
| RL | Medicine | Dermatology | 3 |
| RM | Medicine | Therapeutics. Pharmacology | 4 |
| RS | Medicine | Pharmacy and Materia Medica | 12 |
| RT | Medicine | Nursing | 0 |
| RV | Medicine | Botanic, Thomsonian, and Eclectic Medicine | 0 |
| RX | Medicine | Homeopathy | 0 |
| RZ | Medicine | Other Systems of Medicine | 0 |
| S | Agriculture | Agriculture (General) | 24 |
| SB | Agriculture | Plant Culture | 92 |
| SD | Agriculture | Forestry | 0 |
| SF | Agriculture | Animal Culture | 17 |
| SH | Agriculture | Aquaculture. Fisheries. Angling | 8 |
| SK | Agriculture | Hunting Sports | 15 |
| T | Technology | Technology (General) | 15 |
| TA | Technology | Engineering (General) | 4 |
| TC | Technology | Hydraulic Engineering | 3 |
| TD | Technology | Environmental Technology | 2 |
| TE | Technology | Highway Engineering | 1 |
| TF | Technology | Railroad Engineering & Operation | 6 |
| TG | Technology | Bridge Engineering | 0 |
| TH | Technology | Building Construction | 8 |
| TJ | Technology | Mechanical Engineering & Machinery | 0 |
| TK | Technology | Electrical Engineering. Electronics. Nuclear Engineering | 4 |
| TL | Technology | Motor Vehicles. Aeronautics. Astronautics | 5 |
| TN | Technology | Mining Engineering. Metallurgy | 5 |
| TP | Technology | Chemical Technology | 4 |
| TR | Technology | Photography | 10 |
| TS | Technology | Manufactures | 14 |
| TT | Technology | Handicrafts. Arts and Crafts | 5 |
| TX | Technology | Home Economics | 27 |
| U | Military Science | Military Science (General) | 6 |
| UA | Military Science | Armies | 6 |
| UB | Military Science | Military Administration | 3 |
| UC | Military Science | Maintenance and Transportation | 1 |
| UD | Military Science | Infantry | 2 |
| UE | Military Science | Cavalry. Armor | 1 |
| UF | Military Science | Artillery | 1 |
| UG | Military Science | Military Engineering | 4 |
| UH | Military Science | Other services | 2 |
| V | Naval Science | Naval Science (General) | 2 |
| VA | Naval Science | Navies | 0 |
| VB | Naval Science | Naval Administration | 0 |
| VC | Naval Science | Naval Maintenance | 0 |
| VD | Naval Science | Naval Seamen | 0 |
| VE | Naval Science | Marines | 0 |
| VF | Naval Science | Naval Ordinance | 0 |
| VG | Naval Science | Minor Services of Navies | 0 |
| VK | Naval Science | Navigation | 6 |
| VM | Naval Science | Naval Architecture | 4 |
| Z | Books in General | Bibliography. Library Science | 994 |