Classification
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670 - Manufacturing
4,329
551 - Geology, hydrology & meteorology
4,096
612 - Human physiology
4,080
170 - Ethics
4,052
240 - Christian moral & devotional theology
3,935
001 - Knowledge
3,810
260 - Social & ecclesiastical theology
3,655
384 - Communications; telecommunication
3,571
940 - History of Europe
3,519
615 - Pharmacology & therapeutics
3,460
576 - Genetics & evolution
3,413
580 - Plants (Botany)
3,384
140 - Specific philosophical schools
3,322
512 - Algebra
3,009
003 - Systems
2,914
381 - Commerce
2,909
572 - Biochemistry
2,860
305 - Social groups
2,817
910 - Geography & travel
2,755
150 - Psychology
2,738
400 - Language
2,698
360 - Social problems & services; associations
2,686
410 - Linguistics
2,684
158 - Applied psychology
2,585
336 - Public finance
2,507
660 - Chemical engineering
2,489
577 - Ecology
2,445
541 - Physical chemistry
2,204
770 - Photography, photographs & computer art
2,133
624 - Civil engineering
2,033
657 - Accounting
2,011
550 - Earth sciences
1,977
720 - Architecture
1,896
374 - Adult education
1,809
327 - International relations
1,797
153 - Mental processes & intelligence
1,793
361 - Social problems & social welfare in general
1,740
618 - Gynecology, obstetrics, pediatrics & geriatrics
1,709
840 - Literatures of Romance languages
1,682
516 - Geometry
1,662
614 - Incidence & prevention of disease
1,551
539 - Modern physics
1,540
511 - General principles of mathematics
1,537
303 - Social processes
1,509
547 - Organic chemistry
1,483
371 - Schools & their activities; special education
1,460
420 - English & Old English
1,459
390 - Customs, etiquette & folklore
1,458
341 - Law of nations
1,455
518 - Numerical analysis
1,444
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