Classification
330 - Economics
333 - Economics of land & energy
18
600 - Technology
15
700 - The arts; fine & decorative arts
11
000 - Computer science, information & general works
10
320 - Political science
9
363 - Other social problems & services
8
370 - Education
6
380 - Commerce, communications & transportation
6
300 - Social sciences
5
551 - Geology, hydrology & meteorology
5
620 - Engineering & allied operations
5
900 - History & geography
5
500 - Natural sciences & mathematics
4
576 - Genetics & evolution
4
610 - Medicine & health
4
140 - Specific philosophical schools
3
658 - General management
3
720 - Architecture
3
297 - Islam, Babism & Bahai Faith
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
170 - Ethics
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
400 - Language
1
410 - Linguistics
1
530 - Physics
1
657 - Accounting
1
800 - Literature & rhetoric
1