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