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