Classification
551 - Geology, hydrology & meteorology
320 - Political science
7
700 - The arts; fine & decorative arts
6
330 - Economics
5
363 - Other social problems & services
5
000 - Computer science, information & general works
4
140 - Specific philosophical schools
4
333 - Economics of land & energy
4
370 - Education
4
380 - Commerce, communications & transportation
4
610 - Medicine & health
4
600 - Technology
3
900 - History & geography
3
400 - Language
2
720 - Architecture
2
300 - Social sciences
1
360 - Social problems & services; associations
1
530 - Physics
1
576 - Genetics & evolution
1
620 - Engineering & allied operations
1