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