Classification
320 - Political science
630 - Agriculture & related technologies
330 - Economics
87
333 - Economics of land & energy
28
363 - Other social problems & services
28
300 - Social sciences
22
700 - The arts; fine & decorative arts
21
000 - Computer science, information & general works
19
600 - Technology
16
620 - Engineering & allied operations
15
551 - Geology, hydrology & meteorology
12
581 - Specific topics in natural history
10
610 - Medicine & health
10
900 - History & geography
9
140 - Specific philosophical schools
7
380 - Commerce, communications & transportation
7
580 - Plants (Botany)
6
304 - Factors affecting social behavior
5
340 - Law
4
370 - Education
4
540 - Chemistry & allied sciences
4
100 - Philosophy & psychology
3
657 - Accounting
3
800 - Literature & rhetoric
3
200 - Religion
2
350 - Public administration & military science
2
500 - Natural sciences & mathematics
2
576 - Genetics & evolution
2
658 - General management
2
720 - Architecture
2
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
301 - Sociology & anthropology
1
361 - Social problems & social welfare in general
1
770 - Photography, photographs & computer art
1