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