Classification
140 - Specific philosophical schools
320 - Political science
363 - Other social problems & services
600 - Technology
3
620 - Engineering & allied operations
3
300 - Social sciences
2
330 - Economics
2
333 - Economics of land & energy
2
551 - Geology, hydrology & meteorology
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
340 - Law
1
361 - Social problems & social welfare in general
1
370 - Education
1
610 - Medicine & health
1
700 - The arts; fine & decorative arts
1
800 - Literature & rhetoric
1
900 - History & geography
1