Classification
100 - Philosophy & psychology
333 - Economics of land & energy
370 - Education
15
300 - Social sciences
5
500 - Natural sciences & mathematics
3
900 - History & geography
3
320 - Political science
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
330 - Economics
1
361 - Social problems & social welfare in general
1
400 - Language
1
700 - The arts; fine & decorative arts
1