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