Classification
140 - Specific philosophical schools
170 - Ethics
370 - Education
3
333 - Economics of land & energy
2
363 - Other social problems & services
2
380 - Commerce, communications & transportation
2
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
200 - Religion
1
301 - Sociology & anthropology
1
320 - Political science
1
340 - Law
1
400 - Language
1
620 - Engineering & allied operations
1
900 - History & geography
1