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