Classification
320 - Political science
363 - Other social problems & services
380 - Commerce, communications & transportation
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
620 - Engineering & allied operations
7
720 - Architecture
6
140 - Specific philosophical schools
5
333 - Economics of land & energy
5
330 - Economics
4
000 - Computer science, information & general works
3
340 - Law
3
370 - Education
3
500 - Natural sciences & mathematics
3
576 - Genetics & evolution
3
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
610 - Medicine & health
2
200 - Religion
1
301 - Sociology & anthropology
1
361 - Social problems & social welfare in general
1
580 - Plants (Botany)
1
658 - General management
1