Classification
330 - Economics
527
320 - Political science
511
610 - Medicine & health
222
900 - History & geography
189
370 - Education
156
300 - Social sciences
128
100 - Philosophy & psychology
86
700 - The arts; fine & decorative arts
86
780 - Music
62
140 - Specific philosophical schools
55
400 - Language
50
340 - Law
48
500 - Natural sciences & mathematics
47
333 - Economics of land & energy
41
600 - Technology
39
800 - Literature & rhetoric
38
000 - Computer science, information & general works
28
200 - Religion
26
630 - Agriculture & related technologies
25
301 - Sociology & anthropology
24
304 - Factors affecting social behavior
24
363 - Other social problems & services
22
380 - Commerce, communications & transportation
21
620 - Engineering & allied operations
18
720 - Architecture
18
820 - English & Old English literatures
16
362 - Social welfare problems & services
13
658 - General management
11
302 - Social interaction
10
410 - Linguistics
9
615 - Pharmacology & therapeutics
8
981 - Brazil
8
305 - Social groups
7
590 - Animals (Zoology)
6
336 - Public finance
5
120 - Epistemology, causation & humankind
4
170 - Ethics
4
338 - Production
4
520 - Astronomy & allied sciences
4
530 - Physics
4
540 - Chemistry & allied sciences
4
581 - Specific topics in natural history
4
616 - Diseases
4
070 - News media, journalism & publishing
3
174 - Occupational ethics
3
331 - Labor economics
3
364 - Criminology
3
384 - Communications; telecommunication
3
576 - Genetics & evolution
3
580 - Plants (Botany)
3
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