Classification
550 - Earth sciences
910 - Geography & travel
61
526 - Mathematical geography
42
000 - Computer science, information & general works
6
700 - The arts; fine & decorative arts
4
363 - Other social problems & services
3
380 - Commerce, communications & transportation
3
551 - Geology, hydrology & meteorology
3
610 - Medicine & health
3
320 - Political science
2
330 - Economics
2
333 - Economics of land & energy
2
720 - Architecture
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
530 - Physics
1
580 - Plants (Botany)
1
600 - Technology
1
658 - General management
1
900 - History & geography
1