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