Classification
320 - Political science
576 - Genetics & evolution
900 - History & geography
330 - Economics
346
300 - Social sciences
61
700 - The arts; fine & decorative arts
21
340 - Law
11
100 - Philosophy & psychology
10
600 - Technology
10
140 - Specific philosophical schools
9
200 - Religion
8
363 - Other social problems & services
7
620 - Engineering & allied operations
6
301 - Sociology & anthropology
5
304 - Factors affecting social behavior
5
000 - Computer science, information & general works
4
333 - Economics of land & energy
4
380 - Commerce, communications & transportation
4
800 - Literature & rhetoric
4
297 - Islam, Babism & Bahai Faith
3
500 - Natural sciences & mathematics
3
581 - Specific topics in natural history
3
720 - Architecture
3
370 - Education
2
551 - Geology, hydrology & meteorology
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
296 - Judaism
1
343 - Military, tax, trade & industrial law
1
350 - Public administration & military science
1
398 - Folklore
1
400 - Language
1
410 - Linguistics
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
658 - General management
1
791 - Public performances
1
973 - United States
1