Classification
100 - Philosophy & psychology
330 - Economics
320 - Political science
24
300 - Social sciences
10
900 - History & geography
8
140 - Specific philosophical schools
5
361 - Social problems & social welfare in general
5
363 - Other social problems & services
5
000 - Computer science, information & general works
4
333 - Economics of land & energy
4
340 - Law
4
380 - Commerce, communications & transportation
4
610 - Medicine & health
4
700 - The arts; fine & decorative arts
4
170 - Ethics
3
370 - Education
3
304 - Factors affecting social behavior
2
350 - Public administration & military science
2
551 - Geology, hydrology & meteorology
2
600 - Technology
2
657 - Accounting
2
800 - Literature & rhetoric
2
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
306 - Culture & institutions
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
770 - Photography, photographs & computer art
1