Classification
320 - Political science
330 - Economics
600 - Technology
620 - Engineering & allied operations
333 - Economics of land & energy
31
363 - Other social problems & services
28
900 - History & geography
26
700 - The arts; fine & decorative arts
22
000 - Computer science, information & general works
17
370 - Education
10
551 - Geology, hydrology & meteorology
10
380 - Commerce, communications & transportation
9
140 - Specific philosophical schools
8
300 - Social sciences
8
580 - Plants (Botany)
8
610 - Medicine & health
8
630 - Agriculture & related technologies
8
100 - Philosophy & psychology
7
581 - Specific topics in natural history
6
340 - Law
5
658 - General management
5
170 - Ethics
4
720 - Architecture
4
780 - Music
4
400 - Language
3
410 - Linguistics
3
657 - Accounting
3
304 - Factors affecting social behavior
2
350 - Public administration & military science
2
530 - Physics
2
540 - Chemistry & allied sciences
2
576 - Genetics & evolution
2
200 - Religion
1
301 - Sociology & anthropology
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
770 - Photography, photographs & computer art
1
800 - Literature & rhetoric
1