Classification
380 - Commerce, communications & transportation
700 - The arts; fine & decorative arts
5
600 - Technology
4
500 - Natural sciences & mathematics
3
620 - Engineering & allied operations
3
900 - History & geography
3
000 - Computer science, information & general works
2
330 - Economics
2
340 - Law
2
140 - Specific philosophical schools
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
551 - Geology, hydrology & meteorology
1