Classification
200 - Religion
330 - Economics
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
304 - Factors affecting social behavior
2
380 - Commerce, communications & transportation
2
620 - Engineering & allied operations
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
300 - Social sciences
1
301 - Sociology & anthropology
1
320 - Political science
1
333 - Economics of land & energy
1
340 - Law
1
363 - Other social problems & services
1
370 - Education
1
530 - Physics
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1