Classification
330 - Economics
1,938
331 - Labor economics
73
333 - Economics of land & energy
12
370 - Education
12
700 - The arts; fine & decorative arts
10
363 - Other social problems & services
7
140 - Specific philosophical schools
6
600 - Technology
6
300 - Social sciences
5
380 - Commerce, communications & transportation
5
610 - Medicine & health
5
900 - History & geography
5
320 - Political science
4
339 - Macroeconomics & related topics
4
000 - Computer science, information & general works
3
340 - Law
3
620 - Engineering & allied operations
3
658 - General management
3
304 - Factors affecting social behavior
2
306 - Culture & institutions
2
337 - International economics
2
338 - Production
2
350 - Public administration & military science
2
361 - Social problems & social welfare in general
2
368 - Insurance
2
410 - Linguistics
2
500 - Natural sciences & mathematics
2
650 - Management & auxiliary services
2
100 - Philosophy & psychology
1
158 - Applied psychology
1
170 - Ethics
1
200 - Religion
1
301 - Sociology & anthropology
1
381 - Commerce
1
530 - Physics
1
581 - Specific topics in natural history
1
612 - Human physiology
1
630 - Agriculture & related technologies
1
780 - Music
1