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