Classification
330 - Economics
333 - Economics of land & energy
13
000 - Computer science, information & general works
9
700 - The arts; fine & decorative arts
8
363 - Other social problems & services
7
320 - Political science
6
600 - Technology
6
380 - Commerce, communications & transportation
5
500 - Natural sciences & mathematics
5
340 - Law
4
576 - Genetics & evolution
4
900 - History & geography
4
530 - Physics
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
100 - Philosophy & psychology
2
551 - Geology, hydrology & meteorology
2
140 - Specific philosophical schools
1
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
300 - Social sciences
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
658 - General management
1
800 - Literature & rhetoric
1