Classification
006 - Special computer methods
9,999
005 - Computer programming, programs & data
9,628
616 - Diseases
9,137
621 - Applied physics
8,024
004 - Data processing & computer science
6,503
620 - Engineering & allied operations
5,838
658 - General management
3,780
617 - Surgery & related medical specialties
3,043
610 - Medicine & health
2,858
571 - Physiology & related subjects
2,842
530 - Physics
2,576
629 - Other branches of engineering
2,512
515 - Analysis
2,293
519 - Probabilities & applied mathematics
2,217
306 - Culture & institutions
2,083
333 - Economics of land & energy
2,014
304 - Factors affecting social behavior
1,969
338 - Production
1,738
003 - Systems
1,677
320 - Political science
1,651
551 - Geology, hydrology & meteorology
1,567
612 - Human physiology
1,537
370 - Education
1,491
660 - Chemical engineering
1,184
572 - Biochemistry
1,156
570 - Life sciences; biology
1,149
330 - Economics
1,128
577 - Ecology
1,124
615 - Pharmacology & therapeutics
1,070
363 - Other social problems & services
953
670 - Manufacturing
943
305 - Social groups
942
579 - Microorganisms, fungi & algae
941
910 - Geography & travel
906
518 - Numerical analysis
888
520 - Astronomy & allied sciences
813
512 - Algebra
811
327 - International relations
802
624 - Civil engineering
787
630 - Agriculture & related technologies
692
541 - Physical chemistry
690
613 - Personal health & safety
682
371 - Schools & their activities; special education
670
550 - Earth sciences
665
510 - Mathematics
657
614 - Incidence & prevention of disease
635
301 - Sociology & anthropology
634
580 - Plants (Botany)
597
300 - Social sciences
576
664 - Food technology
576
more ...