Classification
333 - Economics of land & energy
5
580 - Plants (Botany)
363 - Other social problems & services
4
000 - Computer science, information & general works
3
330 - Economics
2
340 - Law
2
630 - Agriculture & related technologies
2
700 - The arts; fine & decorative arts
2
320 - Political science
1
361 - Social problems & social welfare in general
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
530 - Physics
1
581 - Specific topics in natural history
1
600 - Technology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
658 - General management
1
900 - History & geography
1