Classification
610 - Medicine & health
1,523
616 - Diseases
981
330 - Economics
786
320 - Political science
683
340 - Law
667
820 - English & Old English literatures
337
700 - The arts; fine & decorative arts
312
370 - Education
237
900 - History & geography
213
618 - Gynecology, obstetrics, pediatrics & geriatrics
208
333 - Economics of land & energy
178
600 - Technology
163
000 - Computer science, information & general works
156
300 - Social sciences
149
100 - Philosophy & psychology
137
200 - Religion
137
363 - Other social problems & services
133
617 - Surgery & related medical specialties
122
140 - Specific philosophical schools
120
615 - Pharmacology & therapeutics
101
620 - Engineering & allied operations
97
658 - General management
96
380 - Commerce, communications & transportation
85
720 - Architecture
75
170 - Ethics
69
800 - Literature & rhetoric
64
362 - Social welfare problems & services
58
500 - Natural sciences & mathematics
58
630 - Agriculture & related technologies
58
613 - Personal health & safety
57
551 - Geology, hydrology & meteorology
52
400 - Language
51
297 - Islam, Babism & Bahai Faith
48
301 - Sociology & anthropology
47
338 - Production
46
580 - Plants (Botany)
46
346 - Private law
44
612 - Human physiology
43
360 - Social problems & services; associations
42
614 - Incidence & prevention of disease
42
581 - Specific topics in natural history
40
780 - Music
39
304 - Factors affecting social behavior
36
344 - Labor, social, education & cultural law
36
158 - Applied psychology
35
410 - Linguistics
33
576 - Genetics & evolution
32
331 - Labor economics
30
364 - Criminology
27
570 - Life sciences; biology
24
more ...