Classification
363 - Other social problems & services
370 - Education
551 - Geology, hydrology & meteorology
900 - History & geography
333 - Economics of land & energy
7
320 - Political science
5
330 - Economics
5
380 - Commerce, communications & transportation
4
700 - The arts; fine & decorative arts
4
000 - Computer science, information & general works
3
140 - Specific philosophical schools
3
600 - Technology
3
610 - Medicine & health
3
620 - Engineering & allied operations
2
720 - Architecture
2
170 - Ethics
1
400 - Language
1
414 - Phonology & phonetics
1
581 - Specific topics in natural history
1