Classification
170 - Ethics
300 - Social sciences
320 - Political science
2
330 - Economics
340 - Law
2
600 - Technology
900 - History & geography
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
370 - Education
1
380 - Commerce, communications & transportation
1
620 - Engineering & allied operations
1