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