Classification
330 - Economics
333 - Economics of land & energy
363 - Other social problems & services
16
600 - Technology
13
000 - Computer science, information & general works
11
320 - Political science
11
620 - Engineering & allied operations
10
380 - Commerce, communications & transportation
8
630 - Agriculture & related technologies
7
900 - History & geography
7
700 - The arts; fine & decorative arts
6
140 - Specific philosophical schools
5
370 - Education
5
551 - Geology, hydrology & meteorology
5
580 - Plants (Botany)
4
610 - Medicine & health
4
300 - Social sciences
3
340 - Law
3
658 - General management
3
361 - Social problems & social welfare in general
2
581 - Specific topics in natural history
2
100 - Philosophy & psychology
1
304 - Factors affecting social behavior
1
530 - Physics
1
720 - Architecture
1