Classification
333 - Economics of land & energy
2
380 - Commerce, communications & transportation
2
400 - Language
610 - Medicine & health
2
700 - The arts; fine & decorative arts
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
300 - Social sciences
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
370 - Education
1