Classification
300 - Social sciences
320 - Political science
900 - History & geography
100 - Philosophy & psychology
26
340 - Law
23
330 - Economics
15
301 - Sociology & anthropology
11
600 - Technology
10
700 - The arts; fine & decorative arts
8
140 - Specific philosophical schools
7
304 - Factors affecting social behavior
7
620 - Engineering & allied operations
7
363 - Other social problems & services
6
200 - Religion
5
370 - Education
5
380 - Commerce, communications & transportation
5
333 - Economics of land & energy
4
720 - Architecture
4
770 - Photography, photographs & computer art
4
780 - Music
4
361 - Social problems & social welfare in general
3
364 - Criminology
3
576 - Genetics & evolution
3
610 - Medicine & health
3
800 - Literature & rhetoric
3
000 - Computer science, information & general works
2
170 - Ethics
2
360 - Social problems & services; associations
2
400 - Language
2
410 - Linguistics
2
500 - Natural sciences & mathematics
2
120 - Epistemology, causation & humankind
1
530 - Physics
1
581 - Specific topics in natural history
1
658 - General management
1