Classification
330 - Economics
600 - Technology
8
620 - Engineering & allied operations
630 - Agriculture & related technologies
658 - General management
333 - Economics of land & energy
7
580 - Plants (Botany)
5
700 - The arts; fine & decorative arts
5
000 - Computer science, information & general works
4
140 - Specific philosophical schools
4
610 - Medicine & health
4
363 - Other social problems & services
3
900 - History & geography
3
380 - Commerce, communications & transportation
2
551 - Geology, hydrology & meteorology
2
297 - Islam, Babism & Bahai Faith
1
336 - Public finance
1
340 - Law
1
370 - Education
1
581 - Specific topics in natural history
1