Classification
300 - Social sciences
301 - Sociology & anthropology
380 - Commerce, communications & transportation
4
320 - Political science
3
900 - History & geography
3
330 - Economics
2
600 - Technology
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
370 - Education
1
400 - Language
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1