4-digit Nomenclature
| 11 | Logic |
| 1101 | Application of logic |
| 1102 | Deductive logic |
| 1103 | General logic |
| 1104 | Inductive logic |
| 1105 | Methodology |
| 1199 | Other specialities relating to logic |
| 12 | Mathematics |
| 1201 | Algebra |
| 1202 | Analysis and functional analysis |
| 1203 | Computer Sciences (see 3304) |
| 1204 | Geometry |
| 1205 | Number theory |
| 1206 | Numerical analysis |
| 1207 | Operations research |
| 1208 | Probability |
| 1209 | Statistics |
| 1210 | Topology |
| 1299 | Other mathematical specialities |
| 21 | Astronomy, Astrophysics |
| 2101 | Cosmology |
| 2102 | Interplanetary physics (see 2512, 3324) |
| 2103 | Optical astronomy (see 2209) |
| 2104 | Planetology (see 2512, 3324) |
| 2105 | Radio-astronomy |
| 2106 | Solar system |
| 2199 | Other astronomical specialities |
| 22 | Physics |
| 2201 | Acoustics |
| 2202 | Electro-magnetism |
| 2203 | Electronics (see 3307) |
| 2204 | Physics |
| 2205 | Mechanics |
| 2206 | Molecular physics |
| 2207 | Nuclear physics (see 3320) |
| 2208 | Nucleonics |
| 2209 | Optics |
| 2210 | Physical chemistry (see 2307) |
| 2211 | Solid state physics |
| 2212 | Theoretical physics |
| 2213 | Thermodynamics |
| 2214 | Units and constants |
| 2299 | Other physical specialities |
| 23 | Chemistry |
| 2301 | Analytical chemistry |
| 2302 | Biochemistry (see 2306) |
| 2303 | Inorganic chemistry (see 3303) |
| 2304 | Macromolecular chemistry |
| 2305 | Nuclear chemistry |
| 2306 | Organic chemistry |
| 2307 | Physical chemistry (see 2210) |
| 2399 | Other chemical specialities |
| 24 | Life Sciences |
| 2401 | Animal Biology (Zoology) (see 3109) |
| 2402 | Anthropology (physical) (see 51) |
| 2403 | Biochemistry (see 2302) |
| 2404 | Biomathematics |
| 2405 | Biometrics |
| 2406 | Biophysics |
| 2407 | Cell biology |
| 2408 | Ethology |
| 2409 | Genetics |
| 2410 | Human biology (see 32) |
| 2411 | Human physiology |
| 2412 | Immunology |
| 2413 | Insect Biology (Entomology) |
| 2414 | Microbiology |
| 2415 | Molecular biology |
| 2416 | Palaeontology |
| 2417 | Plant Biology (Botany) (see 3103) |
| 2418 | Radiobiology |
| 2419 | Symbiosis |
| 2420 | Virology |
| 2499 | Other biological specialities |
| 25 | Earth and Space Science |
| 2501 | Atmospheric sciences (see 2502, 2509) |
| 2502 | Climatology (see 2501, 2509) |
| 2503 | Geochemistry |
| 2504 | Geodesy |
| 2505 | Geography (see 54) |
| 2506 | Geology |
| 2507 | Geophysics |
| 2508 | Hydrology |
| 2509 | Meteorology (see 2501, 2502) |
| 2510 | Oceanography |
| 2511 | Soil Science |
| 2512 | Space Sciences (see 2102, 2104, 3324) |
| 2599 | Other Earth, Space or Environmental specialities |
| 31 | Agricultural Sciences |
| 3101 | Agricultural chemistry |
| 3102 | Agricultural engineering |
| 3103 | Agronomy |
| 3104 | Animal husbandry |
| 3105 | Fish and wildlife |
| 3106 | Forestry |
| 3107 | Horticulture |
| 3108 | Phytopathology |
| 3109 | Veterinary sciences |
| 3199 | Other agricultural specialities |
| 32 | Medical Sciences |
| 3201 | Clinical sciences |
| 3202 | Epidemiology (see 2414, 2420) |
| 3203 | Forensic medicine |
| 3204 | Occupational medicine |
| 3205 | Internal medicine |
| 3206 | Nutrition sciences (see 3309) |
| 3207 | Pathology |
| 3208 | Pharmacodynamics |
| 3209 | Pharmacology |
| 3210 | Preventive medicine |
| 3211 | Psychiatry |
| 3212 | Public health |
| 3213 | Surgery |
| 3214 | Toxicology |
| 3299 | Other medical specialities |
| 33 | Technological Sciences |
| 3301 | Aeronautical technology and engineering |
| 3302 | Biochemical technology (see 3309) |
| 3303 | Chemical technology and engineering (see 2303, 2304, 2306) |
| 3304 | Computer technology (see 1203) |
| 3305 | Construction technology (see 3312, 5312) |
| 3306 | Electrical technology and engineering |
| 3307 | Electronic technology (see 2202, 2203, 3325) |
| 3308 | Environmental technology and engineering |
| 3309 | Food technology (see 3302, 3206) |
| 3310 | Industrial technology (see 5311) |
| 3311 | Instrumentation technology |
| 3312 | Materials technology |
| 3313 | Mechanical Engineering and technology |
| 3314 | Medical technology |
| 3315 | Metallurgical technology |
| 3316 | Metal products technology |
| 3317 | Motor vehicle technology |
| 3318 | Mining technology |
| 3319 | Naval technology |
| 3320 | Nuclear technology (see 2207) |
| 3321 | Petroleum and coal technology |
| 3322 | Power technology |
| 3323 | Railway technology |
| 3324 | Space technology (see 2512) |
| 3325 | Telecommunications technology (see 2202, 2203, 3307) |
| 3326 | Textile technology |
| 3327 | Transportation systems technology |
| 3328 | Unit operations technology |
| 3329 | Urban Planning |
| 3399 | Other technological specialities |
| 51 | Anthropology |
| 5101 | Cultural anthropology |
| 5102 | Ethnography and Ethnology |
| 5103 | Social anthropology |
| 5199 | Other anthropology specialities |
| 52 | Demography |
| 5201 | Fertility |
| 5202 | General demography |
| 5203 | Geographical demography |
| 5204 | Historical demography |
| 5205 | Mortality |
| 5206 | Population characteristics |
| 5207 | Population size and demographic evolution |
| 5299 | Other demographic specialities |
| 53 | Economic Sciences |
| 5301 | Domestic fiscal policy and public finance |
| 5302 | Econometrics |
| 5303 | Economic accounting |
| 5304 | Economic activity |
| 5305 | Economic systems |
| 5306 | Economics of technological change |
| 5307 | Economic theory |
| 5308 | General economics |
| 5309 | Industrial organization and public policy |
| 5310 | International economics |
| 5311 | Organization and management of enterprises (see 3310) |
| 5312 | Sectorial economics |
| 5399 | Other economic specialities |
| 54 | Geography |
| 5401 | Economic geography |
| 5402 | Historical geography |
| 5403 | Human geography |
| 5404 | Regional geography |
| 5499 | Other geographical specialities |
| 55 | History |
| 5501 | Biographies |
| 5502 | General history |
| 5503 | History of countries |
| 5504 | History by epochs |
| 5505 | Sciences auxiliary to history |
| 5506 | Specialized histories |
| 5599 | Other historical specialities |
| 56 | Juridical Science and Law |
| 5601 | Canon law |
| 5602 | General theory and method |
| 5603 | International law |
| 5604 | Legal organization |
| 5605 | National law and legislation |
| 5699 | Other juridical specialities |
| 57 | Linguistics |
| 5701 | Applied linguistics |
| 5702 | Diachronic linguistics |
| 5703 | Linguistic geography |
| 5704 | Linguistic theory |
| 5705 | Synchronic linguistics |
| 5799 | Other linguistic specialities |
| 58 | Pedagogy |
| 5801 | Educational theory and methods |
| 5802 | Organization and planning of education |
| 5803 | Teacher training and employment |
| 5899 | Other pedagogical specialities |
| 59 | Political Science |
| 5901 | International relations |
| 5902 | Policy sciences |
| 5903 | Political ideologies |
| 5904 | Political institutions |
| 5905 | Political life |
| 5906 | Political sociology |
| 5907 | Political systems |
| 5908 | Political theory |
| 5909 | Public administration |
| 5910 | Public opinion |
| 5999 | Other political science specialities |
| 61 | Psychology |
| 6101 | Abnormal psychology (see 3211) |
| 6102 | Adolescent and child psychology |
| 6103 | Counselling and guidance (see 3211) |
| 6104 | Educational psychology |
| 6105 | Evaluation and measurement in psychology |
| 6106 | Experimental psychology |
| 6107 | General psychology |
| 6108 | Geriatric psychology |
| 6109 | Occupational and personnel psychology |
| 6110 | Parapsychology |
| 6111 | Personality |
| 6112 | Psychological study of social issues |
| 6113 | Psychopharmacology |
| 6114 | Social psychology |
| 6199 | Other psychological specialities |
| 62 | Sciences of Arts and Letters |
| 6201 | Architecture |
| 6202 | Literary theory, analysis and criticism |
| 6203 | Fine arts theory, analysis and criticism |
| 6299 | Other artistic specialities |
| 63 | Sociology |
| 6301 | Cultural sociology |
| 6302 | Experimental sociology |
| 6303 | General sociology |
| 6304 | International disorder |
| 6305 | Mathematical sociology |
| 6306 | Occupational sociology |
| 6307 | Social change and development |
| 6308 | Social communications |
| 6309 | Social groups |
| 6310 | Social problems - Social disorder |
| 6311 | Sociology of human settlements |
| 6399 | Other sociological specialities |
| 71 | Ethics |
| 7101 | Classical ethics |
| 7102 | Ethics of individuals |
| 7103 | Group ethics |
| 7104 | Prospective ethics |
| 7199 | Other specialities relating to ethics |
| 72 | Philosophy |
| 7201 | Philosophy of knowledge |
| 7202 | Philosophical anthropology |
| 7203 | General philosophy |
| 7204 | Philosophical systems |
| 7205 | Philosophy of science |
| 7206 | Philosophy of nature |
| 7207 | Social philosophy |
| 7208 | Philosophical doctrines |
| 7209 | Other philosophical specialities |
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