Classification
000 - Computer science, information & general works
300 - Social sciences
4
320 - Political science
330 - Economics
363 - Other social problems & services
4
600 - Technology
620 - Engineering & allied operations
3
900 - History & geography
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
340 - Law
2
370 - Education
2
380 - Commerce, communications & transportation
2
170 - Ethics
1
200 - Religion
1
301 - Sociology & anthropology
1
333 - Economics of land & energy
1
364 - Criminology
1
610 - Medicine & health
1
658 - General management
1