Classification
140 - Specific philosophical schools
333 - Economics of land & energy
3
363 - Other social problems & services
370 - Education
330 - Economics
2
700 - The arts; fine & decorative arts
2
720 - Architecture
2
000 - Computer science, information & general works
1
320 - Political science
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1
610 - Medicine & health
1