Classification
140 - Specific philosophical schools
320 - Political science
330 - Economics
333 - Economics of land & energy
12
363 - Other social problems & services
600 - Technology
551 - Geology, hydrology & meteorology
6
620 - Engineering & allied operations
5
700 - The arts; fine & decorative arts
5
000 - Computer science, information & general works
4
380 - Commerce, communications & transportation
4
581 - Specific topics in natural history
4
300 - Social sciences
2
361 - Social problems & social welfare in general
2
610 - Medicine & health
2
170 - Ethics
1
200 - Religion
1
336 - Public finance
1
370 - Education
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
657 - Accounting
1
658 - General management
1
720 - Architecture
1
800 - Literature & rhetoric
1
900 - History & geography
1