Classification
320 - Political science
330 - Economics
22
900 - History & geography
7
700 - The arts; fine & decorative arts
6
630 - Agriculture & related technologies
5
000 - Computer science, information & general works
3
300 - Social sciences
3
333 - Economics of land & energy
3
363 - Other social problems & services
2
610 - Medicine & health
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
200 - Religion
1
340 - Law
1
370 - Education
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1
620 - Engineering & allied operations
1
657 - Accounting
1