Classification
333 - Economics of land & energy
320 - Political science
18
100 - Philosophy & psychology
13
330 - Economics
13
300 - Social sciences
12
140 - Specific philosophical schools
9
900 - History & geography
9
363 - Other social problems & services
7
600 - Technology
6
700 - The arts; fine & decorative arts
6
370 - Education
5
610 - Medicine & health
5
551 - Geology, hydrology & meteorology
4
581 - Specific topics in natural history
4
301 - Sociology & anthropology
3
340 - Law
3
170 - Ethics
2
380 - Commerce, communications & transportation
2
530 - Physics
2
620 - Engineering & allied operations
2
200 - Religion
1
304 - Factors affecting social behavior
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
658 - General management
1