Classification
363 - Other social problems & services
330 - Economics
12
333 - Economics of land & energy
11
320 - Political science
8
000 - Computer science, information & general works
6
551 - Geology, hydrology & meteorology
5
630 - Agriculture & related technologies
5
700 - The arts; fine & decorative arts
5
581 - Specific topics in natural history
4
600 - Technology
4
610 - Medicine & health
4
140 - Specific philosophical schools
3
370 - Education
3
380 - Commerce, communications & transportation
3
620 - Engineering & allied operations
3
900 - History & geography
3
580 - Plants (Botany)
2
301 - Sociology & anthropology
1
336 - Public finance
1
340 - Law
1
361 - Social problems & social welfare in general
1
540 - Chemistry & allied sciences
1