Classification
380 - Commerce, communications & transportation
3
551 - Geology, hydrology & meteorology
600 - Technology
3
620 - Engineering & allied operations
330 - Economics
2
580 - Plants (Botany)
2
900 - History & geography
2
000 - Computer science, information & general works
1
320 - Political science
1
333 - Economics of land & energy
1
340 - Law
1
363 - Other social problems & services
1
550 - Earth sciences
1
630 - Agriculture & related technologies
1