Classification
300 - Social sciences
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
600 - Technology
320 - Political science
9
000 - Computer science, information & general works
3
370 - Education
3
650 - Management & auxiliary services
3
657 - Accounting
3
900 - History & geography
3
140 - Specific philosophical schools
2
170 - Ethics
2
200 - Religion
2
333 - Economics of land & energy
2
551 - Geology, hydrology & meteorology
2
620 - Engineering & allied operations
2
658 - General management
2
700 - The arts; fine & decorative arts
2
304 - Factors affecting social behavior
1
340 - Law
1
400 - Language
1
576 - Genetics & evolution
1
610 - Medicine & health
1