Classification
000 - Computer science, information & general works
320 - Political science
300 - Social sciences
17
900 - History & geography
15
700 - The arts; fine & decorative arts
14
100 - Philosophy & psychology
12
363 - Other social problems & services
12
200 - Religion
10
330 - Economics
10
333 - Economics of land & energy
10
600 - Technology
6
301 - Sociology & anthropology
5
380 - Commerce, communications & transportation
5
297 - Islam, Babism & Bahai Faith
4
400 - Language
4
620 - Engineering & allied operations
4
630 - Agriculture & related technologies
4
800 - Literature & rhetoric
4
140 - Specific philosophical schools
3
340 - Law
3
370 - Education
3
610 - Medicine & health
3
304 - Factors affecting social behavior
2
410 - Linguistics
2
576 - Genetics & evolution
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
500 - Natural sciences & mathematics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
551 - Geology, hydrology & meteorology
1