Classification
320 - Political science
330 - Economics
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
620 - Engineering & allied operations
17
333 - Economics of land & energy
14
000 - Computer science, information & general works
10
363 - Other social problems & services
10
380 - Commerce, communications & transportation
9
370 - Education
8
300 - Social sciences
7
630 - Agriculture & related technologies
7
720 - Architecture
6
100 - Philosophy & psychology
5
551 - Geology, hydrology & meteorology
5
610 - Medicine & health
5
580 - Plants (Botany)
4
658 - General management
4
780 - Music
4
140 - Specific philosophical schools
3
400 - Language
3
304 - Factors affecting social behavior
2
410 - Linguistics
2
530 - Physics
2
581 - Specific topics in natural history
2
770 - Photography, photographs & computer art
2
170 - Ethics
1
200 - Religion
1
301 - Sociology & anthropology
1
340 - Law
1
360 - Social problems & services; associations
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1