Classification
320 - Political science
330 - Economics
8
900 - History & geography
700 - The arts; fine & decorative arts
3
200 - Religion
2
333 - Economics of land & energy
2
780 - Music
2
800 - Literature & rhetoric
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
170 - Ethics
1
300 - Social sciences
1
370 - Education
1
380 - Commerce, communications & transportation
1
400 - Language
1
410 - Linguistics
1
530 - Physics
1
581 - Specific topics in natural history
1
600 - Technology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
770 - Photography, photographs & computer art
1