Classification
600 - Technology
620 - Engineering & allied operations
4
900 - History & geography
700 - The arts; fine & decorative arts
3
333 - Economics of land & energy
2
000 - Computer science, information & general works
1
330 - Economics
1
340 - Law
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
530 - Physics
1
551 - Geology, hydrology & meteorology
1
800 - Literature & rhetoric
1