Classification
320 - Political science
330 - Economics
600 - Technology
900 - History & geography
620 - Engineering & allied operations
27
700 - The arts; fine & decorative arts
26
333 - Economics of land & energy
19
300 - Social sciences
15
363 - Other social problems & services
15
380 - Commerce, communications & transportation
15
370 - Education
13
000 - Computer science, information & general works
11
100 - Philosophy & psychology
10
610 - Medicine & health
9
340 - Law
7
140 - Specific philosophical schools
6
551 - Geology, hydrology & meteorology
6
630 - Agriculture & related technologies
6
720 - Architecture
6
780 - Music
6
400 - Language
5
580 - Plants (Botany)
5
304 - Factors affecting social behavior
4
658 - General management
4
170 - Ethics
3
200 - Religion
3
301 - Sociology & anthropology
3
410 - Linguistics
3
530 - Physics
3
576 - Genetics & evolution
3
581 - Specific topics in natural history
3
350 - Public administration & military science
2
770 - Photography, photographs & computer art
2
360 - Social problems & services; associations
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
657 - Accounting
1