Classification
900 - History & geography
29
320 - Political science
17
700 - The arts; fine & decorative arts
17
300 - Social sciences
11
140 - Specific philosophical schools
8
304 - Factors affecting social behavior
8
720 - Architecture
8
100 - Philosophy & psychology
6
200 - Religion
5
333 - Economics of land & energy
5
370 - Education
5
610 - Medicine & health
5
301 - Sociology & anthropology
4
330 - Economics
4
800 - Literature & rhetoric
4
380 - Commerce, communications & transportation
3
000 - Computer science, information & general works
2
297 - Islam, Babism & Bahai Faith
2
363 - Other social problems & services
2
400 - Language
2
600 - Technology
2
620 - Engineering & allied operations
2
780 - Music
2
296 - Judaism
1
340 - Law
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
414 - Phonology & phonetics
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
770 - Photography, photographs & computer art
1