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主題 

1. Biology, Ecology  (341)
2. Agriculture, Forestry and Wildlife  (51)
3. Biogeochemistry  (31)
4. Biology, Limnology  (27)
5. Agriculture, Fisheries and Aquaculture  (25)
6. Biology, Botany  (21)
7. Biology, Zoology  (18)
8. Hydrology  (16)
9. Geography  (15)
10. Remote sensing  (14)
11. Engineering, Environmental  (13)
12. Biology, Microbiology  (12)
13. Biology, Oceanography  (11)
14. Agriculture, Soil Science  (10)
15. Physical Geography  (9)
16. Biology, Plant Physiology  (7)
17. Urban and Regional Planning  (7)
18. Recreation  (7)
19. Anthropology, Cultural  (6)
20. Biology, Molecular  (6)
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著者 

1. University of California, Berkeley  (11)
2. University of California, Davis  (11)
3. University of Virginia  (10)
4. The University of Wisconsin - Madison  (10)
5. Stanford University  (8)
6. University of Waterloo (Canada)  (8)
7. Oregon State University  (8)
8. University of Michigan  (7)
9. University of Maryland, College Park  (7)
10. University of Illinois at Urbana-Champaign  (6)
11. George Mason University  (6)
12. University of Minnesota  (6)
13. University of New Hampshire  (6)
14. Duke University. Ecology  (5)
15. California State University, Fullerton  (4)
16. University of California, Santa Barbara  (4)
17. State University of New York College of Environmental Science and Forestry. Environmental & Forest Biology  (4)
18. The Ohio State University  (4)
19. University of Alberta (Canada)  (4)
20. Duke University. Environment  (4)
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建立日期 

1. 之前1997  (9)
2. 1997到2000  (22)
3. 2001到2004  (107)
4. 2005到2009  (154)
5. 之後 2009  (51)
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