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