Classification
330 - Economics
320 - Political science
39
333 - Economics of land & energy
36
610 - Medicine & health
22
363 - Other social problems & services
20
304 - Factors affecting social behavior
18
900 - History & geography
17
700 - The arts; fine & decorative arts
13
370 - Education
12
000 - Computer science, information & general works
11
600 - Technology
11
658 - General management
9
300 - Social sciences
8
380 - Commerce, communications & transportation
8
580 - Plants (Botany)
8
340 - Law
7
630 - Agriculture & related technologies
7
551 - Geology, hydrology & meteorology
6
140 - Specific philosophical schools
5
576 - Genetics & evolution
5
361 - Social problems & social welfare in general
4
581 - Specific topics in natural history
4
301 - Sociology & anthropology
3
620 - Engineering & allied operations
3
800 - Literature & rhetoric
3
200 - Religion
2
410 - Linguistics
2
100 - Philosophy & psychology
1
297 - Islam, Babism & Bahai Faith
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
364 - Criminology
1
400 - Language
1
500 - Natural sciences & mathematics
1
530 - Physics
1
550 - Earth sciences
1
612 - Human physiology
1
650 - Management & auxiliary services
1
657 - Accounting
1
720 - Architecture
1