Classification
320 - Political science
333 - Economics of land & energy
600 - Technology
7
330 - Economics
6
363 - Other social problems & services
6
000 - Computer science, information & general works
4
370 - Education
4
551 - Geology, hydrology & meteorology
4
700 - The arts; fine & decorative arts
4
380 - Commerce, communications & transportation
3
610 - Medicine & health
3
720 - Architecture
3
630 - Agriculture & related technologies
2
900 - History & geography
2
140 - Specific philosophical schools
1
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
336 - Public finance
1
340 - Law
1
400 - Language
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
800 - Literature & rhetoric
1