Classification
320 - Political science
370 - Education
900 - History & geography
100 - Philosophy & psychology
8
330 - Economics
8
600 - Technology
7
700 - The arts; fine & decorative arts
7
300 - Social sciences
5
333 - Economics of land & energy
5
380 - Commerce, communications & transportation
5
140 - Specific philosophical schools
4
340 - Law
4
363 - Other social problems & services
4
551 - Geology, hydrology & meteorology
3
620 - Engineering & allied operations
3
000 - Computer science, information & general works
2
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
400 - Language
2
500 - Natural sciences & mathematics
2
610 - Medicine & health
2
720 - Architecture
2
770 - Photography, photographs & computer art
2
170 - Ethics
1
200 - Religion
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1
658 - General management
1