Classification
140 - Specific philosophical schools
320 - Political science
330 - Economics
43
333 - Economics of land & energy
23
363 - Other social problems & services
19
700 - The arts; fine & decorative arts
15
300 - Social sciences
14
600 - Technology
10
340 - Law
9
100 - Philosophy & psychology
8
000 - Computer science, information & general works
7
380 - Commerce, communications & transportation
7
581 - Specific topics in natural history
7
900 - History & geography
7
361 - Social problems & social welfare in general
6
551 - Geology, hydrology & meteorology
6
610 - Medicine & health
6
170 - Ethics
4
304 - Factors affecting social behavior
4
370 - Education
4
620 - Engineering & allied operations
4
301 - Sociology & anthropology
3
580 - Plants (Botany)
3
658 - General management
3
576 - Genetics & evolution
2
630 - Agriculture & related technologies
2
720 - Architecture
2
336 - Public finance
1
360 - Social problems & services; associations
1
410 - Linguistics
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
657 - Accounting
1
800 - Literature & rhetoric
1