Classification
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670 - Manufacturing
4,418
520 - Astronomy & allied sciences
4,382
551 - Geology, hydrology & meteorology
4,217
170 - Ethics
4,167
612 - Human physiology
4,112
240 - Christian moral & devotional theology
3,935
260 - Social & ecclesiastical theology
3,655
384 - Communications; telecommunication
3,654
940 - History of Europe
3,541
580 - Plants (Botany)
3,515
576 - Genetics & evolution
3,512
615 - Pharmacology & therapeutics
3,481
140 - Specific philosophical schools
3,355
512 - Algebra
3,048
003 - Systems
3,000
381 - Commerce
2,984
305 - Social groups
2,907
400 - Language
2,888
572 - Biochemistry
2,861
410 - Linguistics
2,805
910 - Geography & travel
2,805
150 - Psychology
2,794
360 - Social problems & services; associations
2,722
158 - Applied psychology
2,681
660 - Chemical engineering
2,543
577 - Ecology
2,470
336 - Public finance
2,330
657 - Accounting
2,226
541 - Physical chemistry
2,217
770 - Photography, photographs & computer art
2,173
624 - Civil engineering
2,078
550 - Earth sciences
1,987
720 - Architecture
1,940
327 - International relations
1,910
153 - Mental processes & intelligence
1,864
374 - Adult education
1,853
361 - Social problems & social welfare in general
1,818
618 - Gynecology, obstetrics, pediatrics & geriatrics
1,736
516 - Geometry
1,689
840 - Literatures of Romance languages
1,682
303 - Social processes
1,615
511 - General principles of mathematics
1,561
539 - Modern physics
1,524
343 - Military, tax, trade & industrial law
1,519
371 - Schools & their activities; special education
1,513
547 - Organic chemistry
1,495
613 - Personal health & safety
1,495
341 - Law of nations
1,491
518 - Numerical analysis
1,461
390 - Customs, etiquette & folklore
1,460
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