Classification
320 - Political science
330 - Economics
576 - Genetics & evolution
600 - Technology
900 - History & geography
100 - Philosophy & psychology
3
300 - Social sciences
3
333 - Economics of land & energy
3
363 - Other social problems & services
3
380 - Commerce, communications & transportation
3
700 - The arts; fine & decorative arts
3
140 - Specific philosophical schools
2
620 - Engineering & allied operations
2
200 - Religion
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
340 - Law
1
350 - Public administration & military science
1
370 - Education
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1