Classification
320 - Political science
340 - Law
900 - History & geography
100 - Philosophy & psychology
23
700 - The arts; fine & decorative arts
21
300 - Social sciences
20
140 - Specific philosophical schools
18
330 - Economics
14
600 - Technology
14
200 - Religion
12
333 - Economics of land & energy
12
363 - Other social problems & services
11
301 - Sociology & anthropology
10
620 - Engineering & allied operations
9
380 - Commerce, communications & transportation
8
370 - Education
7
400 - Language
7
170 - Ethics
5
576 - Genetics & evolution
5
800 - Literature & rhetoric
5
500 - Natural sciences & mathematics
4
720 - Architecture
4
000 - Computer science, information & general works
3
120 - Epistemology, causation & humankind
3
297 - Islam, Babism & Bahai Faith
3
551 - Geology, hydrology & meteorology
3
304 - Factors affecting social behavior
2
361 - Social problems & social welfare in general
2
410 - Linguistics
2
580 - Plants (Botany)
2
658 - General management
2
160 - Logic
1
336 - Public finance
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
414 - Phonology & phonetics
1
530 - Physics
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
657 - Accounting
1
770 - Photography, photographs & computer art
1
780 - Music
1
791 - Public performances
1