Classification
710 - Civic & landscape art
21
577 - Ecology
17
624 - Civil engineering
9
333 - Economics of land & energy
7
628 - Sanitary & municipal engineering
6
338 - Production
5
363 - Other social problems & services
5
634 - Orchards, fruits & forestry
5
551 - Geology, hydrology & meteorology
4
307 - Communities
3
910 - Geography & travel
3
003 - Systems
2
304 - Factors affecting social behavior
2
339 - Macroeconomics & related topics
1
550 - Earth sciences
1
571 - Physiology & related subjects
1
578 - Natural history of organisms
1
580 - Plants (Botany)
1
629 - Other branches of engineering
1
636 - Animal husbandry
1
641 - Food & drink
1
658 - General management
1
664 - Food technology
1
670 - Manufacturing
1