Classification
330 - Economics
363 - Other social problems & services
600 - Technology
610 - Medicine & health
720 - Architecture
900 - History & geography
4
000 - Computer science, information & general works
3
333 - Economics of land & energy
3
380 - Commerce, communications & transportation
3
551 - Geology, hydrology & meteorology
3
700 - The arts; fine & decorative arts
3
320 - Political science
2
370 - Education
2
620 - Engineering & allied operations
2
140 - Specific philosophical schools
1
170 - Ethics
1