Classification
140 - Specific philosophical schools
330 - Economics
380 - Commerce, communications & transportation
658 - General management
600 - Technology
6
000 - Computer science, information & general works
5
333 - Economics of land & energy
5
700 - The arts; fine & decorative arts
5
363 - Other social problems & services
4
610 - Medicine & health
4
320 - Political science
3
551 - Geology, hydrology & meteorology
3
630 - Agriculture & related technologies
3
297 - Islam, Babism & Bahai Faith
2
370 - Education
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
620 - Engineering & allied operations
2
336 - Public finance
1
361 - Social problems & social welfare in general
1
500 - Natural sciences & mathematics
1
720 - Architecture
1
800 - Literature & rhetoric
1
900 - History & geography
1