Classification
200 - Religion
300 - Social sciences
4
320 - Political science
340 - Law
363 - Other social problems & services
4
370 - Education
600 - Technology
900 - History & geography
100 - Philosophy & psychology
3
120 - Epistemology, causation & humankind
3
170 - Ethics
3
000 - Computer science, information & general works
1
330 - Economics
1
380 - Commerce, communications & transportation
1
620 - Engineering & allied operations
1