Classification
304 - Factors affecting social behavior
330 - Economics
380 - Commerce, communications & transportation
700 - The arts; fine & decorative arts
4
333 - Economics of land & energy
3
363 - Other social problems & services
3
000 - Computer science, information & general works
2
370 - Education
2
580 - Plants (Botany)
2
600 - Technology
2
610 - Medicine & health
2
900 - History & geography
2
200 - Religion
1
320 - Political science
1
340 - Law
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1