Classification
320 - Political science
610 - Medicine & health
28
333 - Economics of land & energy
13
700 - The arts; fine & decorative arts
13
330 - Economics
10
363 - Other social problems & services
8
380 - Commerce, communications & transportation
7
600 - Technology
7
000 - Computer science, information & general works
6
370 - Education
6
900 - History & geography
6
140 - Specific philosophical schools
5
304 - Factors affecting social behavior
4
551 - Geology, hydrology & meteorology
4
620 - Engineering & allied operations
4
576 - Genetics & evolution
3
100 - Philosophy & psychology
2
120 - Epistemology, causation & humankind
2
300 - Social sciences
2
350 - Public administration & military science
2
361 - Social problems & social welfare in general
2
400 - Language
2
615 - Pharmacology & therapeutics
2
658 - General management
2
200 - Religion
1
410 - Linguistics
1
530 - Physics
1
550 - Earth sciences
1
581 - Specific topics in natural history
1
720 - Architecture
1