Classification
300 - Social sciences
320 - Political science
610 - Medicine & health
900 - History & geography
100 - Philosophy & psychology
8
301 - Sociology & anthropology
7
333 - Economics of land & energy
7
600 - Technology
6
000 - Computer science, information & general works
4
330 - Economics
4
370 - Education
3
363 - Other social problems & services
2
380 - Commerce, communications & transportation
2
581 - Specific topics in natural history
2
620 - Engineering & allied operations
2
140 - Specific philosophical schools
1
170 - Ethics
1
200 - Religion
1
340 - Law
1
350 - Public administration & military science
1
364 - Criminology
1
400 - Language
1
500 - Natural sciences & mathematics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
780 - Music
1