Classification
300 - Social sciences
72
301 - Sociology & anthropology
41
320 - Political science
23
100 - Philosophy & psychology
19
333 - Economics of land & energy
19
900 - History & geography
18
610 - Medicine & health
17
700 - The arts; fine & decorative arts
17
330 - Economics
16
140 - Specific philosophical schools
15
363 - Other social problems & services
14
200 - Religion
13
000 - Computer science, information & general works
12
600 - Technology
12
304 - Factors affecting social behavior
11
340 - Law
9
370 - Education
9
800 - Literature & rhetoric
6
361 - Social problems & social welfare in general
5
380 - Commerce, communications & transportation
5
360 - Social problems & services; associations
4
170 - Ethics
3
364 - Criminology
3
500 - Natural sciences & mathematics
3
576 - Genetics & evolution
3
120 - Epistemology, causation & humankind
2
297 - Islam, Babism & Bahai Faith
2
362 - Social welfare problems & services
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
720 - Architecture
2
780 - Music
2
006 - Special computer methods
1
303 - Social processes
1
305 - Social groups
1
306 - Culture & institutions
1
307 - Communities
1
372 - Elementary education
1
374 - Adult education
1
378 - Higher education
1
379 - Public policy issues in education
1
400 - Language
1
410 - Linguistics
1
540 - Chemistry & allied sciences
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
791 - Public performances
1