Classification
320 - Political science
333 - Economics of land & energy
300 - Social sciences
8
330 - Economics
7
100 - Philosophy & psychology
6
140 - Specific philosophical schools
5
363 - Other social problems & services
5
600 - Technology
4
610 - Medicine & health
4
900 - History & geography
4
370 - Education
3
551 - Geology, hydrology & meteorology
3
581 - Specific topics in natural history
3
700 - The arts; fine & decorative arts
3
301 - Sociology & anthropology
2
620 - Engineering & allied operations
2
340 - Law
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
380 - Commerce, communications & transportation
1