Classification
320 - Political science
363 - Other social problems & services
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
620 - Engineering & allied operations
18
333 - Economics of land & energy
12
330 - Economics
10
380 - Commerce, communications & transportation
10
720 - Architecture
7
000 - Computer science, information & general works
6
551 - Geology, hydrology & meteorology
6
140 - Specific philosophical schools
5
370 - Education
5
576 - Genetics & evolution
4
581 - Specific topics in natural history
4
610 - Medicine & health
4
340 - Law
3
500 - Natural sciences & mathematics
3
580 - Plants (Botany)
3
301 - Sociology & anthropology
2
630 - Agriculture & related technologies
2
658 - General management
2
100 - Philosophy & psychology
1
170 - Ethics
1
200 - Religion
1
300 - Social sciences
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1