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1. Environmental Sciences  (21)
2. Agriculture, Forestry and Wildlife  (20)
3. Biology, Plant Physiology  (10)
4. Biology, Entomology  (9)
5. Biogeochemistry  (7)
6. Biology, Genetics  (6)
7. Biology, Zoology  (5)
8. Agriculture, Range Management  (5)
9. Geography  (4)
10. Biology, Microbiology  (4)
11. Agriculture, Soil Science  (4)
12. Climate change  (4)
13. Agriculture, Plant Pathology  (4)
14. Natural resource management  (3)
15. Remote sensing  (3)
16. Biology, Oceanography  (3)
17. Agriculture, Horticulture  (2)
18. Biology, Conservation  (2)
19. Agriculture, Plant Culture  (2)
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著者 

1. University of California, Davis  (8)
2. Oregon State University  (6)
3. University of Michigan  (5)
4. Colorado State University  (4)
5. The University of Wisconsin - Madison  (4)
6. University of Miami  (3)
7. Boston University  (3)
8. University of Illinois at Chicago  (3)
9. Texas Christian University  (3)
10. Utah State University  (2)
11. University of California, Santa Cruz  (2)
12. The Pennsylvania State University  (2)
13. University of Colorado at Boulder. Ecology and Evolutionary Biology  (2)
14. Michigan State University. Plant Biology  (2)
15. Harvard University  (2)
16. University of Puerto Rico, Mayaguez (Puerto Rico)  (2)
17. University of California, Santa Barbara  (2)
18. Columbia University. Ecology, Evolution and Environmental Biology  (2)
19. University of Florida  (2)
20. California State University, Long Beach  (2)
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建立日期 

1. 之前1996  (5)
2. 1996到1999  (13)
3. 2000到2003  (39)
4. 2004到2008  (60)
5. 之後 2008  (60)
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語言 

1. 英文  (175)
2. 西班牙文  (2)
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