Classification
900 - History & geography
35
320 - Political science
18
300 - Social sciences
14
700 - The arts; fine & decorative arts
14
800 - Literature & rhetoric
11
610 - Medicine & health
10
304 - Factors affecting social behavior
8
380 - Commerce, communications & transportation
8
370 - Education
7
400 - Language
7
100 - Philosophy & psychology
6
330 - Economics
6
340 - Law
6
000 - Computer science, information & general works
5
140 - Specific philosophical schools
5
551 - Geology, hydrology & meteorology
5
600 - Technology
5
200 - Religion
4
333 - Economics of land & energy
4
363 - Other social problems & services
4
720 - Architecture
4
301 - Sociology & anthropology
3
576 - Genetics & evolution
3
620 - Engineering & allied operations
3
630 - Agriculture & related technologies
3
170 - Ethics
2
297 - Islam, Babism & Bahai Faith
2
410 - Linguistics
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
612 - Human physiology
2
160 - Logic
1
350 - Public administration & military science
1
398 - Folklore
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
615 - Pharmacology & therapeutics
1
770 - Photography, photographs & computer art
1
780 - Music
1