Classification
320 - Political science
330 - Economics
1,345
300 - Social sciences
300
900 - History & geography
161
340 - Law
138
630 - Agriculture & related technologies
132
700 - The arts; fine & decorative arts
45
500 - Natural sciences & mathematics
22
100 - Philosophy & psychology
19
333 - Economics of land & energy
18
800 - Literature & rhetoric
14
170 - Ethics
13
370 - Education
10
140 - Specific philosophical schools
9
304 - Factors affecting social behavior
9
600 - Technology
8
200 - Religion
7
380 - Commerce, communications & transportation
7
363 - Other social problems & services
6
610 - Medicine & health
6
400 - Language
5
550 - Earth sciences
4
160 - Logic
3
410 - Linguistics
3
301 - Sociology & anthropology
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
720 - Architecture
2
000 - Computer science, information & general works
1
120 - Epistemology, causation & humankind
1
297 - Islam, Babism & Bahai Faith
1
336 - Public finance
1
345 - Criminal law
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
780 - Music
1