Classification
320 - Political science
363 - Other social problems & services
330 - Economics
6
700 - The arts; fine & decorative arts
6
333 - Economics of land & energy
5
581 - Specific topics in natural history
4
900 - History & geography
4
000 - Computer science, information & general works
3
140 - Specific philosophical schools
3
630 - Agriculture & related technologies
3
100 - Philosophy & psychology
2
200 - Religion
2
380 - Commerce, communications & transportation
2
551 - Geology, hydrology & meteorology
2
600 - Technology
2
610 - Medicine & health
2
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
370 - Education
1
414 - Phonology & phonetics
1
520 - Astronomy & allied sciences
1
580 - Plants (Botany)
1
620 - Engineering & allied operations
1
720 - Architecture
1