Classification
300 - Social sciences
600 - Technology
900 - History & geography
700 - The arts; fine & decorative arts
3
301 - Sociology & anthropology
2
320 - Political science
2
333 - Economics of land & energy
2
380 - Commerce, communications & transportation
2
620 - Engineering & allied operations
2
630 - Agriculture & related technologies
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
363 - Other social problems & services
1
370 - Education
1
500 - Natural sciences & mathematics
1
610 - Medicine & health
1
720 - Architecture
1
780 - Music
1