Classification
370 - Education
900 - History & geography
31
330 - Economics
29
610 - Medicine & health
22
700 - The arts; fine & decorative arts
17
304 - Factors affecting social behavior
16
320 - Political science
16
333 - Economics of land & energy
14
340 - Law
14
400 - Language
13
100 - Philosophy & psychology
10
600 - Technology
10
300 - Social sciences
9
380 - Commerce, communications & transportation
6
140 - Specific philosophical schools
5
170 - Ethics
2
363 - Other social problems & services
2
800 - Literature & rhetoric
2
000 - Computer science, information & general works
1
200 - Religion
1
336 - Public finance
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1
650 - Management & auxiliary services
1
720 - Architecture
1
780 - Music
1
972 - Middle America; Mexico
1