Classification
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520 - Astronomy & allied sciences
4,380
670 - Manufacturing
4,364
551 - Geology, hydrology & meteorology
4,184
170 - Ethics
4,149
612 - Human physiology
4,062
240 - Christian moral & devotional theology
3,935
260 - Social & ecclesiastical theology
3,655
003 - Systems
3,631
384 - Communications; telecommunication
3,606
940 - History of Europe
3,529
580 - Plants (Botany)
3,487
576 - Genetics & evolution
3,482
615 - Pharmacology & therapeutics
3,432
140 - Specific philosophical schools
3,331
512 - Algebra
2,999
381 - Commerce
2,929
400 - Language
2,880
305 - Social groups
2,874
572 - Biochemistry
2,843
410 - Linguistics
2,789
910 - Geography & travel
2,776
360 - Social problems & services; associations
2,721
150 - Psychology
2,711
158 - Applied psychology
2,636
660 - Chemical engineering
2,502
577 - Ecology
2,455
336 - Public finance
2,326
657 - Accounting
2,235
541 - Physical chemistry
2,191
770 - Photography, photographs & computer art
2,163
624 - Civil engineering
2,021
550 - Earth sciences
1,979
720 - Architecture
1,933
327 - International relations
1,848
153 - Mental processes & intelligence
1,826
374 - Adult education
1,805
361 - Social problems & social welfare in general
1,795
618 - Gynecology, obstetrics, pediatrics & geriatrics
1,723
840 - Literatures of Romance languages
1,682
516 - Geometry
1,674
511 - General principles of mathematics
1,551
539 - Modern physics
1,520
547 - Organic chemistry
1,490
040 - [Unassigned]
1,477
371 - Schools & their activities; special education
1,467
390 - Customs, etiquette & folklore
1,460
613 - Personal health & safety
1,460
420 - English & Old English
1,458
518 - Numerical analysis
1,451
341 - Law of nations
1,421
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