Classification
900 - History & geography
800 - Literature & rhetoric
22
100 - Philosophy & psychology
21
320 - Political science
19
200 - Religion
17
300 - Social sciences
17
340 - Law
15
140 - Specific philosophical schools
14
700 - The arts; fine & decorative arts
12
301 - Sociology & anthropology
11
330 - Economics
10
370 - Education
10
333 - Economics of land & energy
9
380 - Commerce, communications & transportation
8
610 - Medicine & health
8
400 - Language
5
410 - Linguistics
5
170 - Ethics
4
297 - Islam, Babism & Bahai Faith
4
304 - Factors affecting social behavior
4
600 - Technology
4
500 - Natural sciences & mathematics
3
620 - Engineering & allied operations
3
780 - Music
3
000 - Computer science, information & general works
2
361 - Social problems & social welfare in general
2
363 - Other social problems & services
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
658 - General management
2
770 - Photography, photographs & computer art
2
120 - Epistemology, causation & humankind
1
160 - Logic
1
296 - Judaism
1
364 - Criminology
1
530 - Physics
1
540 - Chemistry & allied sciences
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
590 - Animals (Zoology)
1