Classification
304 - Factors affecting social behavior
330 - Economics
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
380 - Commerce, communications & transportation
4
620 - Engineering & allied operations
3
000 - Computer science, information & general works
2
200 - Religion
2
320 - Political science
2
333 - Economics of land & energy
2
370 - Education
2
340 - Law
1
363 - Other social problems & services
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1
720 - Architecture
1