Classification
616 - Diseases
771
006 - Special computer methods
566
005 - Computer programming, programs & data
473
617 - Surgery & related medical specialties
390
004 - Data processing & computer science
318
621 - Applied physics
285
620 - Engineering & allied operations
241
610 - Medicine & health
175
571 - Physiology & related subjects
168
658 - General management
131
570 - Life sciences; biology
120
612 - Human physiology
102
000 - Computer science, information & general works
97
530 - Physics
97
333 - Economics of land & energy
96
304 - Factors affecting social behavior
91
519 - Probabilities & applied mathematics
89
577 - Ecology
84
630 - Agriculture & related technologies
83
551 - Geology, hydrology & meteorology
77
629 - Other branches of engineering
76
306 - Culture & institutions
65
338 - Production
65
615 - Pharmacology & therapeutics
63
500 - Natural sciences & mathematics
60
660 - Chemical engineering
59
330 - Economics
57
579 - Microorganisms, fungi & algae
57
003 - Systems
56
515 - Analysis
55
572 - Biochemistry
55
618 - Gynecology, obstetrics, pediatrics & geriatrics
54
363 - Other social problems & services
53
745 - Decorative arts
53
910 - Geography & travel
53
580 - Plants (Botany)
50
664 - Food technology
44
300 - Social sciences
43
613 - Personal health & safety
43
614 - Incidence & prevention of disease
38
371 - Schools & their activities; special education
36
550 - Earth sciences
36
670 - Manufacturing
36
331 - Labor economics
35
518 - Numerical analysis
35
520 - Astronomy & allied sciences
33
624 - Civil engineering
32
510 - Mathematics
30
320 - Political science
29
631 - Techniques, equipment & materials
29
more ...