Classification
300 - Social sciences
363 - Other social problems & services
600 - Technology
620 - Engineering & allied operations
17
320 - Political science
14
330 - Economics
14
333 - Economics of land & energy
14
900 - History & geography
10
140 - Specific philosophical schools
9
610 - Medicine & health
8
301 - Sociology & anthropology
7
380 - Commerce, communications & transportation
7
581 - Specific topics in natural history
6
700 - The arts; fine & decorative arts
6
370 - Education
5
551 - Geology, hydrology & meteorology
5
000 - Computer science, information & general works
4
340 - Law
4
576 - Genetics & evolution
4
580 - Plants (Botany)
4
630 - Agriculture & related technologies
4
100 - Philosophy & psychology
3
170 - Ethics
3
800 - Literature & rhetoric
3
200 - Religion
2
304 - Factors affecting social behavior
2
400 - Language
2
500 - Natural sciences & mathematics
2
720 - Architecture
2
350 - Public administration & military science
1
540 - Chemistry & allied sciences
1
650 - Management & auxiliary services
1
657 - Accounting
1
658 - General management
1