Classification
006 - Special computer methods
13,444
005 - Computer programming, programs & data
9,458
616 - Diseases
7,967
621 - Applied physics
6,593
004 - Data processing & computer science
5,049
620 - Engineering & allied operations
5,009
658 - General management
3,359
617 - Surgery & related medical specialties
2,819
571 - Physiology & related subjects
2,759
610 - Medicine & health
2,740
530 - Physics
2,534
003 - Systems
2,297
515 - Analysis
2,232
519 - Probabilities & applied mathematics
2,181
629 - Other branches of engineering
2,035
306 - Culture & institutions
2,010
304 - Factors affecting social behavior
1,911
333 - Economics of land & energy
1,892
338 - Production
1,607
320 - Political science
1,564
551 - Geology, hydrology & meteorology
1,535
612 - Human physiology
1,494
370 - Education
1,453
040 - [Unassigned]
1,364
660 - Chemical engineering
1,148
572 - Biochemistry
1,139
577 - Ecology
1,110
615 - Pharmacology & therapeutics
1,046
570 - Life sciences; biology
1,002
330 - Economics
999
579 - Microorganisms, fungi & algae
926
670 - Manufacturing
924
305 - Social groups
903
910 - Geography & travel
888
518 - Numerical analysis
881
363 - Other social problems & services
824
520 - Astronomy & allied sciences
810
512 - Algebra
797
327 - International relations
755
624 - Civil engineering
750
630 - Agriculture & related technologies
680
541 - Physical chemistry
669
613 - Personal health & safety
666
550 - Earth sciences
655
614 - Incidence & prevention of disease
638
510 - Mathematics
634
301 - Sociology & anthropology
624
371 - Schools & their activities; special education
621
580 - Plants (Botany)
583
664 - Food technology
555
more ...