Classification
338 - Production
621
330 - Economics
462
333 - Economics of land & energy
338
320 - Political science
142
363 - Other social problems & services
75
658 - General management
64
339 - Macroeconomics & related topics
53
337 - International economics
52
304 - Factors affecting social behavior
44
332 - Financial economics
35
581 - Specific topics in natural history
34
700 - The arts; fine & decorative arts
31
630 - Agriculture & related technologies
30
306 - Culture & institutions
29
331 - Labor economics
27
600 - Technology
27
300 - Social sciences
25
340 - Law
24
610 - Medicine & health
23
900 - History & geography
22
380 - Commerce, communications & transportation
21
620 - Engineering & allied operations
20
551 - Geology, hydrology & meteorology
18
361 - Social problems & social welfare in general
17
100 - Philosophy & psychology
16
140 - Specific philosophical schools
16
327 - International relations
16
000 - Computer science, information & general works
15
170 - Ethics
14
301 - Sociology & anthropology
14
336 - Public finance
14
500 - Natural sciences & mathematics
12
370 - Education
11
305 - Social groups
10
343 - Military, tax, trade & industrial law
9
576 - Genetics & evolution
7
577 - Ecology
7
302 - Social interaction
6
307 - Communities
5
657 - Accounting
5
174 - Occupational ethics
4
621 - Applied physics
4
650 - Management & auxiliary services
4
910 - Geography & travel
4
200 - Religion
3
303 - Social processes
3
351 - Public administration
3
360 - Social problems & services; associations
3
382 - International commerce
3
400 - Language
3
more ...