Classification
006 - Special computer methods
12,252
658 - General management
10,692
616 - Diseases
10,366
005 - Computer programming, programs & data
10,226
621 - Applied physics
8,684
004 - Data processing & computer science
6,450
620 - Engineering & allied operations
6,255
610 - Medicine & health
3,867
306 - Culture & institutions
3,639
320 - Political science
3,510
617 - Surgery & related medical specialties
3,426
530 - Physics
2,956
629 - Other branches of engineering
2,945
571 - Physiology & related subjects
2,923
519 - Probabilities & applied mathematics
2,710
370 - Education
2,585
515 - Analysis
2,544
304 - Factors affecting social behavior
2,296
338 - Production
2,259
333 - Economics of land & energy
2,239
003 - Systems
2,161
301 - Sociology & anthropology
1,946
305 - Social groups
1,647
330 - Economics
1,631
551 - Geology, hydrology & meteorology
1,611
612 - Human physiology
1,603
650 - Management & auxiliary services
1,467
302 - Social interaction
1,396
615 - Pharmacology & therapeutics
1,336
657 - Accounting
1,321
510 - Mathematics
1,318
300 - Social sciences
1,305
570 - Life sciences; biology
1,274
660 - Chemical engineering
1,239
332 - Financial economics
1,238
670 - Manufacturing
1,221
577 - Ecology
1,209
572 - Biochemistry
1,188
624 - Civil engineering
1,149
327 - International relations
1,049
512 - Algebra
1,006
579 - Microorganisms, fungi & algae
958
363 - Other social problems & services
955
518 - Numerical analysis
947
910 - Geography & travel
936
520 - Astronomy & allied sciences
895
371 - Schools & their activities; special education
876
343 - Military, tax, trade & industrial law
847
361 - Social problems & social welfare in general
831
613 - Personal health & safety
827
more ...