| Class Description | Class Code | Counter |
| Agriculture | S | 1 |
| Agriculture:- Animal culture | SF | 2 |
| Agriculture:- Aquaculture, Fisheries, Angling | SH | 3 |
| Agriculture:- Forestry | SD | 4 |
| Agriculture:- Hunting sports | SK | 5 |
| Agriculture:- Plant culture | SB | 6 |
| Bibliography, Library science | Z | 7 |
| Education | L | 8 |
| Education:- History of education | LA | 9 |
| Education:- Individual institutions:- America (except US) | LE | 10 |
| Education:- Individual institutions:- Europe | LF | 11 |
| Education:- Individual institutions:- United States | LD | 12 |
| Education:- Special aspects of education | LC | 13 |
| Education:- Textbooks | LT | 14 |
| Education:- Theory and practice of education | LB | 15 |
| Fine Arts | N | 16 |
| Fine Arts:- Architecture | NA | 17 |
| Fine Arts:- Arts in general | NX | 18 |
| Fine Arts:- Decorative and Applied Arts, Decoration and Ornament | NK | 19 |
| Fine Arts:- Drawing, Design, Illustration | NC | 20 |
| Fine Arts:- Painting | ND | 21 |
| Fine Arts:- Print media | NE | 22 |
| Fine Arts:- Sculpture | NB | 23 |
| General Works:- Academies and International Associations, Congresses | AS | 24 |
| General Works:- Collections, Series, Collected works, Pamphlets | AC | 25 |
| General Works:- Dictionaries and other general reference books | AG | 26 |
| General Works:- Encyclopedias | AE | 27 |
| General Works:- History of scholarship and learning, The humanities | AZ | 28 |
| General Works:- Periodicals | AP | 29 |
| Geography, Anthropology, Recreation | G | 30 |
| Geography, Anthropology, Recreation:- Anthropology | GN | 31 |
| Geography, Anthropology, Recreation:- Folklore | GR | 32 |
| Geography, Anthropology, Recreation:- Human ecology, Anthropogeography | GF | 33 |
| Geography, Anthropology, Recreation:- Manners and customs | GT | 34 |
| Geography, Anthropology, Recreation:- Oceanography | GC | 35 |
| Geography, Anthropology, Recreation:- Physical geography | GB | 36 |
| Geography, Anthropology, Recreation:- Recreation, Leisure | GV | 37 |
| History of the Americas:- Caribbean area. Caribbean sea | F2155 | 38 |
| History of the Americas:- Caribbean area. Cuba | F1751 | 39 |
| History of the Americas:- Lesser Antilles | F2001 | 40 |
| History:- America | E | 41 |
| History:- America:- America | E011 | 42 |
| History:- America:- Civil War period (1861-1865) | E456 | 43 |
| History:- America:- Colonial History (1607-1775) | E186 | 44 |
| History:- America:- Late nineteenth century (1865-1900) | E660 | 45 |
| History:- America:- Later twentieth century (1961-) | E838 | 46 |
| History:- America:- Revolution (1775-1783) | E201 | 47 |
| History:- America:- Revolution to the Civil War (1783-1861) | E300 | 48 |
| History:- America:- Twentieth century | E740 | 49 |
| History:- America:- Twenty-first century | E895 | 50 |
| History:- America:- United States | E151 | 51 |
| History:- Archaeology | CC | 52 |
| History:- Biography | CT | 53 |
| History:- Genealogy | CS | 54 |
| History:- General and Eastern Hemisphere | D | 55 |
| History:- General and Eastern Hemisphere:- Africa | DT | 56 |
| History:- General and Eastern Hemisphere:- Asia | DS | 57 |
| History:- General and Eastern Hemisphere:- Austria, Hungary, Czech Republic, Slovakia | DB | 58 |
| History:- General and Eastern Hemisphere:- Balkan Peninsula, Turkey | DR | 59 |
| History:- General and Eastern Hemisphere:- Eastern Europe | DJK | 60 |
| History:- General and Eastern Hemisphere:- France, Andorra, Monaco | DC | 61 |
| History:- General and Eastern Hemisphere:- Germany | DD | 62 |
| History:- General and Eastern Hemisphere:- Great Britain, Ireland, Central Europe | DA | 63 |
| History:- General and Eastern Hemisphere:- Greece | DF | 64 |
| History:- General and Eastern Hemisphere:- History of Gypsies | DX | 65 |
| History:- General and Eastern Hemisphere:- History of Oceania (South Seas) | DU | 66 |
| History:- General and Eastern Hemisphere:- Italy, Vatican City, Malta | DG | 67 |
| History:- General and Eastern Hemisphere:- Netherlands | DJ | 68 |
| History:- General and Eastern Hemisphere:- Netherlands, Belgium, Luxemburg | DH | 69 |
| History:- General and Eastern Hemisphere:- Northern Europe, Scandinavia | DL | 70 |
| History:- General and Eastern Hemisphere:- Russia, Former Soviet Republics, Poland | DK | 71 |
| History:- General and Eastern Hemisphere:- Spain, Portugal | DP | 72 |
| History:- General and Eastern Hemisphere:- Switzerland | DQ | 73 |
| History:- General and Eastern Hemisphere:- The Mediterranean Region, The Greco-Roman World | DE | 74 |
| History:- General and Eastern Hemisphere:- World War I (1914-1918) | D501 | 75 |
| History:- Heraldry | CR | 76 |
| History:- History of civilization | CB | 77 |
| History:- Inscriptions, Epigraphy | CN | 78 |
| History:- Numismatics | CJ | 79 |
| Language and Literatures | P | 80 |
| Language and Literatures:- American and Canadian literature | PS | 81 |
| Language and Literatures:- Classical Languages and Literature | PA | 82 |
| Language and Literatures:- English | PE | 83 |
| Language and Literatures:- English literature | PR | 84 |
| Language and Literatures:- Finno-Ugrian and Basque languages and literatures | PH | 85 |
| Language and Literatures:- General works | PB | 86 |
| Language and Literatures:- Germanic and Scandinavian languages | PD | 87 |
| Language and Literatures:- Germanic, Scandinavian, and Icelandic literatures | PT | 88 |
| Language and Literatures:- Indigenous American and Artificial Languages | PM | 89 |
| Language and Literatures:- Indo-Iranian literatures | PK | 90 |
| Language and Literatures:- Juvenile belles lettres | PZ | 91 |
| Language and Literatures:- Languages and literatures of Eastern Asia, Africa, Oceania | PL | 92 |
| Language and Literatures:- Literature:- General, Criticism, Collections | PN | 93 |
| Language and Literatures:- Oriental languages and literatures | PJ | 94 |
| Language and Literatures:- Romance languages:- Italian, French, Spanish, Portuguese | PC | 95 |
| Language and Literatures:- Romance literatures:- French, Italian, Spanish, Portuguese | PQ | 96 |
| Language and Literatures:- Slavic (including Russian), Languages and Literature | PG | 97 |
| Language and Literatures:- West Germanic | PF | 98 |
| Latin America local history:- Argentina | F2801 | 99 |
| Latin America local history:- Brazil | F2501 | 100 |
| Latin America local history:- Colombia | F2251 | 101 |
| Latin America local history:- General | F1401 | 102 |
| Latin America local history:- Honduras | F1501 | 103 |
| Latin America local history:- Panama | F1561 | 104 |
| Latin America local history:- Paraguay | F2661 | 105 |
| Latin America local history:- Peru | F3401 | 106 |
| Latin America local history:- South America. General | F2201 | 107 |
| Law in general, Comparative and uniform law, Jurisprudence | K | 108 |
| Law in general, Comparative and uniform law, Jurisprudence:- America, North America | KDZ | 109 |
| Law in general, Comparative and uniform law, Jurisprudence:- Canada | KE | 110 |
| Law in general, Comparative and uniform law, Jurisprudence:- Europe | KJ | 111 |
| Law in general, Comparative and uniform law, Jurisprudence:- History of canon law | KBR | 112 |
| Law in general, Comparative and uniform law, Jurisprudence:- Japan | KNX | 113 |
| Law in general, Comparative and uniform law, Jurisprudence:- South America | KH | 114 |
| Law in general, Comparative and uniform law, Jurisprudence:- United Kingdom and Ireland | KD | 115 |
| Law in general, Comparative and uniform law, Jurisprudence:- United States | KF | 116 |
| Medicine | R | 117 |
| Medicine:- Dentistry | RK | 118 |
| Medicine:- Dermatology | RL | 119 |
| Medicine:- Gynecology and obstetrics | RG | 120 |
| Medicine:- Homeopathy | RX | 121 |
| Medicine:- Internal medicine | RC | 122 |
| Medicine:- Nursing | RT | 123 |
| Medicine:- Other systems of medicine | RZ | 124 |
| Medicine:- Otorhinolaryngology | RF | 125 |
| Medicine:- Pathology | RB | 126 |
| Medicine:- Pediatrics | RJ | 127 |
| Medicine:- Pharmacy and materia medica | RS | 128 |
| Medicine:- Public aspects of medicine | RA | 129 |
| Medicine:- Surgery | RD | 130 |
| Medicine:- Therapeutics, Pharmacology | RM | 131 |
| Military science | U | 132 |
| Military science:- Armies:- Organization, distribution, military situation | UA | 133 |
| Military science:- Cavalry, Armor | UE | 134 |
| Military science:- Military engineering | UG | 135 |
| Military science:- Other services | UH | 136 |
| Naval science | V | 137 |
| Naval science:- Naval architecture, Shipbuilding, Marine engineering | VM | 138 |
| Naval science:- Navies:- Organization, distribution, naval situation | VA | 139 |
| Naval science:- Navigation, Merchant marine | VK | 140 |
| No Class | | 141 |
| North America local history:- Canada | F1001 | 142 |
| North America local history:- Mexico | F1201 | 143 |
| Philosophy, Psychology, Religion | B | 144 |
| Philosophy, Psychology, Religion:- Aesthetics | BH | 145 |
| Philosophy, Psychology, Religion:- Buddhism | BQ | 146 |
| Philosophy, Psychology, Religion:- Christianity | BR | 147 |
| Philosophy, Psychology, Religion:- Christianity:- Churches, Church movements | BX | 148 |
| Philosophy, Psychology, Religion:- Christianity:- Doctrinal theology, God, Christology | BT | 149 |
| Philosophy, Psychology, Religion:- Christianity:- Practical theology, Worship | BV | 150 |
| Philosophy, Psychology, Religion:- Christianity:- The Bible, Old and New Testament | BS | 151 |
| Philosophy, Psychology, Religion:- Ethics, Social usages, Etiquette, Religion | BJ | 152 |
| Philosophy, Psychology, Religion:- Islam, Bahaism, Theosophy, Other and new beliefs | BP | 153 |
| Philosophy, Psychology, Religion:- Judaism | BM | 154 |
| Philosophy, Psychology, Religion:- Logic | BC | 155 |
| Philosophy, Psychology, Religion:- Psychology, Philosophy, Psychoanalysis | BF | 156 |
| Philosophy, Psychology, Religion:- Religion:- General, Miscellaneous and Atheism | BL | 157 |
| Philosophy, Psychology, Religion:- Speculative Philosophy, General Philosophical works | BD | 158 |
| Political science | J | 159 |
| Political science:- Colonies and colonization, International migration | JV | 160 |
| Political science:- International law | JX | 161 |
| Political science:- Local government, Municipal government | JS | 162 |
| Political science:- Political inst. and pub. Admin.:- America | JL | 163 |
| Political science:- Political inst. and pub. Admin.:- Asia, Africa and Oceania | JQ | 164 |
| Political science:- Political inst. and pub. Admin.:- Europe | JN | 165 |
| Political science:- Political inst. and pub. Admin.:- United States | JK | 166 |
| Political science:- Political institutions and public administration | JF | 167 |
| Political science:- Political science | JA | 168 |
| Political science:- Political theory | JC | 169 |
| Science | Q | 170 |
| Science:- Astronomy | QB | 171 |
| Science:- Biology | QH301 | 172 |
| Science:- Botany | QK | 173 |
| Science:- Chemistry | QD | 174 |
| Science:- Geology | QE | 175 |
| Science:- Human anatomy | QM | 176 |
| Science:- Mathematics | QA | 177 |
| Science:- Microbiology | QR | 178 |
| Science:- Natural history | QH | 179 |
| Science:- Physics | QC | 180 |
| Science:- Physiology | QP | 181 |
| Science:- Zoology | QL | 182 |
| Social sciences | H | 183 |
| Social sciences:- Commerce | HF | 184 |
| Social sciences:- Communities, Classes, Races | HT | 185 |
| Social sciences:- Economic history and conditions, Production | HD | 186 |
| Social sciences:- Economic history and conditions, Special topics | HC | 187 |
| Social sciences:- Economic theory, Demography | HB | 188 |
| Social sciences:- Finance | HG | 189 |
| Social sciences:- Public finance | HJ | 190 |
| Social sciences:- Social history and conditions, Social problems | HN | 191 |
| Social sciences:- Social pathology, Social and Public Welfare | HV | 192 |
| Social sciences:- Socialism, Communism, Anarchism | HX | 193 |
| Social sciences:- Societies:- secret, benevolent, etc. | HS | 194 |
| Social sciences:- Sociology | HM | 195 |
| Social sciences:- Statistics | HA | 196 |
| Social sciences:- The family, Marriage, Sex and Gender | HQ | 197 |
| Social sciences:- Transportation and communications | HE | 198 |
| Technology | T | 199 |
| Technology:- Bridge engineering | TG | 200 |
| Technology:- Building construction | TH | 201 |
| Technology:- Chemical technology | TP | 202 |
| Technology:- Electrical, Electronics and Nuclear engineering | TK | 203 |
| Technology:- Engineering and Civil engineering | TA | 204 |
| Technology:- Handicrafts, Arts and crafts | TT | 205 |
| Technology:- Highway engineering, Roads and pavements | TE | 206 |
| Technology:- Home economics | TX | 207 |
| Technology:- Manufactures | TS | 208 |
| Technology:- Mechanical engineering and machinery | TJ | 209 |
| Technology:- Mining engineering, Metallurgy | TN | 210 |
| Technology:- Motor vehicles, Aeronautics, Astronautics | TL | 211 |
| Technology:- Ocean engineering | TC | 212 |
| Technology:- Photography | TR | 213 |
| Technology:- Railroad engineering and operation | TF | 214 |
| United States and British, Dutch, French, and Latin America local history | F | 215 |
| United States local history:- Atlantic coast. Middle Atlantic States | F106 | 216 |
| United States local history:- Central American, West Indian, and other countries protected by and having close political affiliations with the United States | F975 | 217 |
| United States local history:- Mississippi River and Valley. Middle West | F350.5 | 218 |
| United States local history:- New England | F001 | 219 |
| United States local history:- New Southwest. Colorado River, Canyon, and Valley | F786 | 220 |
| United States local history:- Ohio River and Valley. | F516 | 221 |
| United States local history:- Old Northwest. Northwest Territory | F476 | 222 |
| United States local history:- Old Southwest. Lower Mississippi Valley | F396 | 223 |
| United States local history:- Pacific States | F850.5 | 224 |
| United States local history:- Rocky Mountains. Yellowstone National Park | F721 | 225 |
| United States local history:- The South. South Atlantic States | F206 | 226 |
| United States local history:- The West. Trans-Mississippi Region. Great Plains | F590.3 | 227 |