Classification
000 - Computer science, information & general works
320 - Political science
380 - Commerce, communications & transportation
700 - The arts; fine & decorative arts
4
720 - Architecture
900 - History & geography
333 - Economics of land & energy
3
600 - Technology
3
610 - Medicine & health
3
330 - Economics
2
363 - Other social problems & services
2
620 - Engineering & allied operations
2
140 - Specific philosophical schools
1
370 - Education
1
400 - Language
1
550 - Earth sciences
1
551 - Geology, hydrology & meteorology
1
800 - Literature & rhetoric
1