Classification
320 - Political science
333 - Economics of land & energy
363 - Other social problems & services
600 - Technology
5
700 - The arts; fine & decorative arts
5
000 - Computer science, information & general works
4
330 - Economics
3
380 - Commerce, communications & transportation
2
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
658 - General management
2
140 - Specific philosophical schools
1
300 - Social sciences
1
340 - Law
1
370 - Education
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
720 - Architecture
1