Classification
616 - Diseases
1,011
610 - Medicine & health
688
617 - Surgery & related medical specialties
550
006 - Special computer methods
219
330 - Economics
192
615 - Pharmacology & therapeutics
166
700 - The arts; fine & decorative arts
155
612 - Human physiology
153
600 - Technology
130
004 - Data processing & computer science
129
005 - Computer programming, programs & data
120
620 - Engineering & allied operations
120
340 - Law
115
370 - Education
102
333 - Economics of land & energy
95
363 - Other social problems & services
81
900 - History & geography
72
140 - Specific philosophical schools
69
618 - Gynecology, obstetrics, pediatrics & geriatrics
69
320 - Political science
65
613 - Personal health & safety
63
000 - Computer science, information & general works
61
621 - Applied physics
52
629 - Other branches of engineering
52
580 - Plants (Botany)
51
100 - Philosophy & psychology
49
150 - Psychology
48
614 - Incidence & prevention of disease
47
061 - Organizations in North America
44
624 - Civil engineering
44
300 - Social sciences
41
380 - Commerce, communications & transportation
39
364 - Criminology
38
577 - Ecology
37
658 - General management
37
551 - Geology, hydrology & meteorology
36
570 - Life sciences; biology
35
690 - Buildings
30
500 - Natural sciences & mathematics
29
691 - Building materials
29
306 - Culture & institutions
28
301 - Sociology & anthropology
27
155 - Differential & developmental psychology
25
304 - Factors affecting social behavior
22
361 - Social problems & social welfare in general
22
571 - Physiology & related subjects
22
362 - Social welfare problems & services
19
630 - Agriculture & related technologies
19
001 - Knowledge
18
720 - Architecture
18
more ...