Classification
170 - Ethics
320 - Political science
581 - Specific topics in natural history
900 - History & geography
600 - Technology
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
200 - Religion
1
300 - Social sciences
1
301 - Sociology & anthropology
1
330 - Economics
1
333 - Economics of land & energy
1
370 - Education
1
530 - Physics
1
610 - Medicine & health
1
620 - Engineering & allied operations
1