Classification
370 - Education
780 - Music
333 - Economics of land & energy
3
900 - History & geography
3
000 - Computer science, information & general works
2
100 - Philosophy & psychology
2
380 - Commerce, communications & transportation
2
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
301 - Sociology & anthropology
1
320 - Political science
1
330 - Economics
1
363 - Other social problems & services
1
500 - Natural sciences & mathematics
1
600 - Technology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1