Classification
100 - Philosophy & psychology
170 - Ethics
3
600 - Technology
3
140 - Specific philosophical schools
2
320 - Political science
2
330 - Economics
2
370 - Education
2
900 - History & geography
2
000 - Computer science, information & general works
1
200 - Religion
1
380 - Commerce, communications & transportation
1
400 - Language
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
780 - Music
1
800 - Literature & rhetoric
1