Classification
320 - Political science
576 - Genetics & evolution
900 - History & geography
330 - Economics
347
300 - Social sciences
56
700 - The arts; fine & decorative arts
18
340 - Law
12
140 - Specific philosophical schools
11
600 - Technology
9
100 - Philosophy & psychology
7
363 - Other social problems & services
6
620 - Engineering & allied operations
6
200 - Religion
5
301 - Sociology & anthropology
4
333 - Economics of land & energy
4
380 - Commerce, communications & transportation
4
800 - Literature & rhetoric
4
304 - Factors affecting social behavior
3
500 - Natural sciences & mathematics
3
581 - Specific topics in natural history
3
720 - Architecture
3
000 - Computer science, information & general works
2
370 - Education
2
551 - Geology, hydrology & meteorology
2
791 - Public performances
2
120 - Epistemology, causation & humankind
1
296 - Judaism
1
297 - Islam, Babism & Bahai Faith
1
343 - Military, tax, trade & industrial law
1
350 - Public administration & military science
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
658 - General management
1
973 - United States
1