Classification
100 - Philosophy & psychology
140 - Specific philosophical schools
333 - Economics of land & energy
3
370 - Education
610 - Medicine & health
700 - The arts; fine & decorative arts
3
170 - Ethics
1
200 - Religion
1
300 - Social sciences
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
320 - Political science
1
330 - Economics
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
400 - Language
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1
620 - Engineering & allied operations
1