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主題 

1. Economics, General  (21)
2. Agriculture, Forestry and Wildlife  (12)
3. Anthropology, Cultural  (7)
4. Agriculture, Fisheries and Aquaculture  (7)
5. Recreation  (6)
6. Political Science, Public Administration  (6)
7. Urban and Regional Planning  (5)
8. Geography  (5)
9. Sociology, Social Structure and Development  (5)
10. Biology, Ecology  (4)
11. Agriculture, General  (4)
12. Engineering, Agricultural  (3)
13. Sociology, Public and Social Welfare  (3)
14. Business Administration, Management  (2)
15. Agriculture, Agronomy  (2)
16. Engineering, Environmental  (2)
17. Operations research  (2)
18. Energy  (2)
19. Hydrology  (2)
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著者 

1. University of California, Berkeley  (9)
2. The Ohio State University  (6)
3. University of Minnesota  (5)
4. University of Illinois at Urbana-Champaign  (5)
5. University of Guelph (Canada)  (5)
6. University of California, Davis  (3)
7. The University of Wisconsin - Madison  (3)
8. University of Alberta (Canada)  (2)
9. Clemson University  (2)
10. University of Rhode Island  (2)
11. McGill University (Canada)  (2)
12. Michigan State University  (2)
13. University of Victoria (Canada)  (2)
14. Oregon State University  (2)
15. Texas A&M University  (2)
16. Stanford University  (2)
17. The Pennsylvania State University  (2)
18. State University of New York College of Environmental Science and Forestry  (2)
19. Ameden, Holly Anne  (1)
20. Yale University  (1)
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建立日期 

1. 之前1996  (3)
2. 1996到1998  (8)
3. 1999到2001  (19)
4. 2002到2005  (35)
5. 之後 2005  (24)
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