Classification
170 - Ethics
300 - Social sciences
330 - Economics
3
000 - Computer science, information & general works
2
320 - Political science
2
340 - Law
2
600 - Technology
2
900 - History & geography
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
158 - Applied psychology
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
338 - Production
1
370 - Education
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
650 - Management & auxiliary services
1
658 - General management
1