Classification
140 - Specific philosophical schools
320 - Political science
370 - Education
300 - Social sciences
19
333 - Economics of land & energy
15
900 - History & geography
15
100 - Philosophy & psychology
14
700 - The arts; fine & decorative arts
13
340 - Law
12
330 - Economics
10
363 - Other social problems & services
9
200 - Religion
7
600 - Technology
7
610 - Medicine & health
7
000 - Computer science, information & general works
5
301 - Sociology & anthropology
5
304 - Factors affecting social behavior
5
380 - Commerce, communications & transportation
5
551 - Geology, hydrology & meteorology
4
170 - Ethics
3
297 - Islam, Babism & Bahai Faith
3
720 - Architecture
3
800 - Literature & rhetoric
3
576 - Genetics & evolution
2
620 - Engineering & allied operations
2
780 - Music
2
120 - Epistemology, causation & humankind
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
530 - Physics
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
658 - General management
1