Classification
380 - Commerce, communications & transportation
610 - Medicine & health
11
363 - Other social problems & services
5
576 - Genetics & evolution
5
000 - Computer science, information & general works
4
140 - Specific philosophical schools
4
304 - Factors affecting social behavior
3
330 - Economics
3
370 - Education
3
700 - The arts; fine & decorative arts
3
900 - History & geography
3
600 - Technology
2
320 - Political science
1
333 - Economics of land & energy
1
364 - Criminology
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
615 - Pharmacology & therapeutics
1
630 - Agriculture & related technologies
1
658 - General management
1
800 - Literature & rhetoric
1