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