Classification
600 - Technology
8
620 - Engineering & allied operations
7
900 - History & geography
7
333 - Economics of land & energy
6
000 - Computer science, information & general works
5
700 - The arts; fine & decorative arts
5
380 - Commerce, communications & transportation
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
800 - Literature & rhetoric
2
330 - Economics
1
363 - Other social problems & services
1
540 - Chemistry & allied sciences
1