Classification
710 - Civic & landscape art
30
577 - Ecology
18
624 - Civil engineering
9
333 - Economics of land & energy
7
338 - Production
7
363 - Other social problems & services
6
628 - Sanitary & municipal engineering
6
634 - Orchards, fruits & forestry
5
551 - Geology, hydrology & meteorology
4
307 - Communities
3
910 - Geography & travel
3
304 - Factors affecting social behavior
2
330 - Economics
1
339 - Macroeconomics & related topics
1
388 - Transportation; ground transportation
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