Classification
200 - Religion
576 - Genetics & evolution
900 - History & geography
18
320 - Political science
9
100 - Philosophy & psychology
8
300 - Social sciences
7
140 - Specific philosophical schools
6
297 - Islam, Babism & Bahai Faith
5
400 - Language
4
700 - The arts; fine & decorative arts
4
370 - Education
3
380 - Commerce, communications & transportation
3
000 - Computer science, information & general works
2
170 - Ethics
2
296 - Judaism
2
340 - Law
2
410 - Linguistics
2
530 - Physics
2
600 - Technology
2
800 - Literature & rhetoric
2
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
330 - Economics
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
398 - Folklore
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
770 - Photography, photographs & computer art
1
780 - Music
1