Classification
320 - Political science
370 - Education
333 - Economics of land & energy
24
300 - Social sciences
19
330 - Economics
19
900 - History & geography
19
700 - The arts; fine & decorative arts
14
363 - Other social problems & services
12
100 - Philosophy & psychology
11
140 - Specific philosophical schools
10
610 - Medicine & health
7
380 - Commerce, communications & transportation
6
600 - Technology
5
800 - Literature & rhetoric
5
000 - Computer science, information & general works
4
301 - Sociology & anthropology
4
304 - Factors affecting social behavior
4
340 - Law
4
410 - Linguistics
4
551 - Geology, hydrology & meteorology
4
170 - Ethics
3
400 - Language
3
200 - Religion
2
297 - Islam, Babism & Bahai Faith
2
500 - Natural sciences & mathematics
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
658 - General management
2
720 - Architecture
2
120 - Epistemology, causation & humankind
1
336 - Public finance
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
576 - Genetics & evolution
1
620 - Engineering & allied operations
1
770 - Photography, photographs & computer art
1
780 - Music
1
791 - Public performances
1