Classification
330 - Economics
28
333 - Economics of land & energy
7
363 - Other social problems & services
7
600 - Technology
4
000 - Computer science, information & general works
3
320 - Political science
3
620 - Engineering & allied operations
3
140 - Specific philosophical schools
2
610 - Medicine & health
2
900 - History & geography
2
370 - Education
1
380 - Commerce, communications & transportation
1
400 - Language
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
658 - General management
1
700 - The arts; fine & decorative arts
1
780 - Music
1
800 - Literature & rhetoric
1