Classification
658 - General management
11,166
616 - Diseases
10,976
005 - Computer programming, programs & data
10,321
006 - Special computer methods
10,296
621 - Applied physics
9,448
004 - Data processing & computer science
7,116
620 - Engineering & allied operations
6,719
610 - Medicine & health
3,948
306 - Culture & institutions
3,704
320 - Political science
3,576
617 - Surgery & related medical specialties
3,563
629 - Other branches of engineering
3,282
530 - Physics
2,983
571 - Physiology & related subjects
2,957
519 - Probabilities & applied mathematics
2,742
370 - Education
2,619
515 - Analysis
2,592
338 - Production
2,347
304 - Factors affecting social behavior
2,345
333 - Economics of land & energy
2,323
301 - Sociology & anthropology
2,022
003 - Systems
1,814
330 - Economics
1,727
305 - Social groups
1,674
551 - Geology, hydrology & meteorology
1,636
612 - Human physiology
1,631
650 - Management & auxiliary services
1,487
302 - Social interaction
1,422
615 - Pharmacology & therapeutics
1,372
570 - Life sciences; biology
1,357
510 - Mathematics
1,335
657 - Accounting
1,331
332 - Financial economics
1,272
300 - Social sciences
1,265
660 - Chemical engineering
1,260
670 - Manufacturing
1,236
577 - Ecology
1,217
572 - Biochemistry
1,199
624 - Civil engineering
1,184
327 - International relations
1,090
363 - Other social problems & services
1,029
512 - Algebra
1,018
579 - Microorganisms, fungi & algae
972
518 - Numerical analysis
953
910 - Geography & travel
951
371 - Schools & their activities; special education
907
520 - Astronomy & allied sciences
900
343 - Military, tax, trade & industrial law
870
613 - Personal health & safety
844
361 - Social problems & social welfare in general
840
more ...