Classification
600 - Technology
700 - The arts; fine & decorative arts
780 - Music
900 - History & geography
13
330 - Economics
10
620 - Engineering & allied operations
10
000 - Computer science, information & general works
9
300 - Social sciences
8
370 - Education
7
100 - Philosophy & psychology
5
140 - Specific philosophical schools
5
380 - Commerce, communications & transportation
5
770 - Photography, photographs & computer art
5
320 - Political science
4
333 - Economics of land & energy
4
400 - Language
3
630 - Agriculture & related technologies
3
340 - Law
2
410 - Linguistics
2
500 - Natural sciences & mathematics
2
610 - Medicine & health
2
612 - Human physiology
2
658 - General management
2
720 - Architecture
2
304 - Factors affecting social behavior
1
363 - Other social problems & services
1
530 - Physics
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1