Classification
140 - Specific philosophical schools
330 - Economics
333 - Economics of land & energy
5
600 - Technology
5
304 - Factors affecting social behavior
4
363 - Other social problems & services
3
000 - Computer science, information & general works
2
300 - Social sciences
2
340 - Law
2
361 - Social problems & social welfare in general
2
370 - Education
2
620 - Engineering & allied operations
2
630 - Agriculture & related technologies
2
320 - Political science
1
350 - Public administration & military science
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
658 - General management
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1