Classification
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520 - Astronomy & allied sciences
4,390
670 - Manufacturing
4,358
551 - Geology, hydrology & meteorology
4,171
170 - Ethics
4,144
612 - Human physiology
4,109
240 - Christian moral & devotional theology
3,935
260 - Social & ecclesiastical theology
3,655
384 - Communications; telecommunication
3,602
940 - History of Europe
3,525
580 - Plants (Botany)
3,488
576 - Genetics & evolution
3,481
615 - Pharmacology & therapeutics
3,471
140 - Specific philosophical schools
3,330
512 - Algebra
3,015
003 - Systems
2,967
381 - Commerce
2,916
400 - Language
2,882
305 - Social groups
2,857
572 - Biochemistry
2,852
410 - Linguistics
2,803
910 - Geography & travel
2,766
150 - Psychology
2,750
360 - Social problems & services; associations
2,721
158 - Applied psychology
2,612
660 - Chemical engineering
2,498
577 - Ecology
2,447
336 - Public finance
2,333
657 - Accounting
2,219
541 - Physical chemistry
2,202
770 - Photography, photographs & computer art
2,159
624 - Civil engineering
2,032
550 - Earth sciences
1,982
720 - Architecture
1,933
374 - Adult education
1,828
327 - International relations
1,824
153 - Mental processes & intelligence
1,820
361 - Social problems & social welfare in general
1,805
618 - Gynecology, obstetrics, pediatrics & geriatrics
1,719
840 - Literatures of Romance languages
1,682
516 - Geometry
1,668
303 - Social processes
1,550
511 - General principles of mathematics
1,540
539 - Modern physics
1,534
547 - Organic chemistry
1,486
614 - Incidence & prevention of disease
1,483
341 - Law of nations
1,462
390 - Customs, etiquette & folklore
1,460
420 - English & Old English
1,460
371 - Schools & their activities; special education
1,456
518 - Numerical analysis
1,447
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