Classification
100 - Philosophy & psychology
300 - Social sciences
320 - Political science
330 - Economics
340 - Law
370 - Education
900 - History & geography
4
600 - Technology
3
140 - Specific philosophical schools
2
301 - Sociology & anthropology
2
400 - Language
2
620 - Engineering & allied operations
2
658 - General management
2
700 - The arts; fine & decorative arts
2
170 - Ethics
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
380 - Commerce, communications & transportation
1
410 - Linguistics
1
576 - Genetics & evolution
1
770 - Photography, photographs & computer art
1
780 - Music
1