Classification
320 - Political science
330 - Economics
380 - Commerce, communications & transportation
600 - Technology
333 - Economics of land & energy
29
700 - The arts; fine & decorative arts
19
363 - Other social problems & services
18
900 - History & geography
16
000 - Computer science, information & general works
14
370 - Education
12
620 - Engineering & allied operations
11
300 - Social sciences
10
551 - Geology, hydrology & meteorology
9
610 - Medicine & health
7
658 - General management
7
340 - Law
6
576 - Genetics & evolution
6
140 - Specific philosophical schools
5
630 - Agriculture & related technologies
5
400 - Language
4
657 - Accounting
4
720 - Architecture
4
100 - Philosophy & psychology
3
200 - Religion
3
304 - Factors affecting social behavior
3
580 - Plants (Botany)
3
780 - Music
3
800 - Literature & rhetoric
3
410 - Linguistics
2
500 - Natural sciences & mathematics
2
581 - Specific topics in natural history
2
170 - Ethics
1
301 - Sociology & anthropology
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
530 - Physics
1
650 - Management & auxiliary services
1