Classification
100 - Philosophy & psychology
370 - Education
900 - History & geography
15
300 - Social sciences
13
333 - Economics of land & energy
11
320 - Political science
9
700 - The arts; fine & decorative arts
9
140 - Specific philosophical schools
7
600 - Technology
7
610 - Medicine & health
5
170 - Ethics
4
380 - Commerce, communications & transportation
3
400 - Language
3
576 - Genetics & evolution
3
800 - Literature & rhetoric
3
000 - Computer science, information & general works
2
200 - Religion
2
363 - Other social problems & services
2
530 - Physics
2
770 - Photography, photographs & computer art
2
120 - Epistemology, causation & humankind
1
297 - Islam, Babism & Bahai Faith
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
340 - Law
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1