Classification
320 - Political science
330 - Economics
340 - Law
363 - Other social problems & services
600 - Technology
333 - Economics of land & energy
2
380 - Commerce, communications & transportation
2
000 - Computer science, information & general works
1
200 - Religion
1
300 - Social sciences
1
301 - Sociology & anthropology
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
657 - Accounting
1
900 - History & geography
1