Classification
330 - Economics
1,056
304 - Factors affecting social behavior
476
320 - Political science
408
610 - Medicine & health
224
700 - The arts; fine & decorative arts
169
300 - Social sciences
165
000 - Computer science, information & general works
139
333 - Economics of land & energy
127
570 - Life sciences; biology
122
900 - History & geography
112
363 - Other social problems & services
104
140 - Specific philosophical schools
81
577 - Ecology
81
576 - Genetics & evolution
78
600 - Technology
76
301 - Sociology & anthropology
69
380 - Commerce, communications & transportation
66
580 - Plants (Botany)
66
340 - Law
56
551 - Geology, hydrology & meteorology
51
630 - Agriculture & related technologies
47
620 - Engineering & allied operations
46
306 - Culture & institutions
44
370 - Education
43
581 - Specific topics in natural history
43
658 - General management
40
305 - Social groups
39
100 - Philosophy & psychology
35
338 - Production
34
519 - Probabilities & applied mathematics
33
820 - English & Old English literatures
30
500 - Natural sciences & mathematics
27
571 - Physiology & related subjects
23
579 - Microorganisms, fungi & algae
23
361 - Social problems & social welfare in general
22
331 - Labor economics
21
515 - Analysis
21
170 - Ethics
18
307 - Communities
17
591 - Specific topics in natural history
17
200 - Religion
15
414 - Phonology & phonetics
15
613 - Personal health & safety
15
614 - Incidence & prevention of disease
15
720 - Architecture
15
400 - Language
14
540 - Chemistry & allied sciences
13
612 - Human physiology
13
800 - Literature & rhetoric
13
339 - Macroeconomics & related topics
12
more ...