Classification
100 - Philosophy & psychology
300 - Social sciences
301 - Sociology & anthropology
320 - Political science
340 - Law
900 - History & geography
4
000 - Computer science, information & general works
3
140 - Specific philosophical schools
3
330 - Economics
3
370 - Education
3
600 - Technology
3
170 - Ethics
2
200 - Religion
2
364 - Criminology
2
700 - The arts; fine & decorative arts
2
304 - Factors affecting social behavior
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
530 - Physics
1
576 - Genetics & evolution
1
610 - Medicine & health
1
620 - Engineering & allied operations
1