Classification
100 - Philosophy & psychology
1
140 - Specific philosophical schools
2
200 - Religion
1
300 - Social sciences
1
301 - Sociology & anthropology
1
320 - Political science
1
330 - Economics
2
333 - Economics of land & energy
1
363 - Other social problems & services
2
380 - Commerce, communications & transportation
1
530 - Physics
1
581 - Specific topics in natural history
1
600 - Technology
620 - Engineering & allied operations
2
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
2
900 - History & geography
1