Classification
320 - Political science
330 - Economics
551 - Geology, hydrology & meteorology
900 - History & geography
363 - Other social problems & services
9
700 - The arts; fine & decorative arts
8
333 - Economics of land & energy
7
600 - Technology
6
380 - Commerce, communications & transportation
5
000 - Computer science, information & general works
4
370 - Education
4
581 - Specific topics in natural history
4
610 - Medicine & health
4
620 - Engineering & allied operations
4
140 - Specific philosophical schools
3
580 - Plants (Botany)
2
720 - Architecture
2
340 - Law
1
360 - Social problems & services; associations
1
414 - Phonology & phonetics
1