Classification
658 - General management
11,171
616 - Diseases
10,009
006 - Special computer methods
9,806
005 - Computer programming, programs & data
9,387
621 - Applied physics
8,915
004 - Data processing & computer science
7,603
620 - Engineering & allied operations
5,592
306 - Culture & institutions
3,486
610 - Medicine & health
3,435
617 - Surgery & related medical specialties
3,433
320 - Political science
3,412
519 - Probabilities & applied mathematics
3,370
629 - Other branches of engineering
3,115
530 - Physics
2,536
338 - Production
2,517
370 - Education
2,449
515 - Analysis
2,376
571 - Physiology & related subjects
2,041
333 - Economics of land & energy
1,915
304 - Factors affecting social behavior
1,836
330 - Economics
1,734
301 - Sociology & anthropology
1,692
650 - Management & auxiliary services
1,680
612 - Human physiology
1,656
305 - Social groups
1,583
551 - Geology, hydrology & meteorology
1,583
302 - Social interaction
1,409
615 - Pharmacology & therapeutics
1,396
300 - Social sciences
1,255
577 - Ecology
1,255
614 - Incidence & prevention of disease
1,254
570 - Life sciences; biology
1,199
510 - Mathematics
1,170
572 - Biochemistry
1,163
332 - Financial economics
1,162
624 - Civil engineering
1,145
660 - Chemical engineering
1,140
670 - Manufacturing
1,112
657 - Accounting
1,093
541 - Physical chemistry
995
512 - Algebra
987
520 - Astronomy & allied sciences
986
327 - International relations
938
518 - Numerical analysis
926
363 - Other social problems & services
912
003 - Systems
866
579 - Microorganisms, fungi & algae
862
361 - Social problems & social welfare in general
826
371 - Schools & their activities; special education
808
910 - Geography & travel
780
more ...