Classification
320 - Political science
363 - Other social problems & services
630 - Agriculture & related technologies
333 - Economics of land & energy
22
330 - Economics
21
000 - Computer science, information & general works
13
700 - The arts; fine & decorative arts
13
600 - Technology
11
620 - Engineering & allied operations
10
581 - Specific topics in natural history
9
551 - Geology, hydrology & meteorology
7
610 - Medicine & health
6
304 - Factors affecting social behavior
4
340 - Law
4
580 - Plants (Botany)
4
900 - History & geography
4
100 - Philosophy & psychology
3
140 - Specific philosophical schools
3
300 - Social sciences
3
380 - Commerce, communications & transportation
3
200 - Religion
2
370 - Education
2
540 - Chemistry & allied sciences
2
576 - Genetics & evolution
2
657 - Accounting
2
720 - Architecture
2
800 - Literature & rhetoric
2
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
301 - Sociology & anthropology
1
350 - Public administration & military science
1
500 - Natural sciences & mathematics
1
658 - General management
1