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主題 

1. Biology, Ecology  (184)
2. Environmental sciences  (159)
3. Economics, Agricultural  (54)
4. Remote sensing  (50)
5. Recreation  (49)
6. Geography  (33)
7. Natural resource management  (31)
8. Agriculture, Wood Technology  (30)
9. Biology, Zoology  (29)
10. Biogeochemistry  (29)
11. Biology, Botany  (28)
12. Urban and Regional Planning  (26)
13. Anthropology, Cultural  (26)
14. Agriculture, Soil Science  (23)
15. Economics, General  (19)
16. Agriculture, Range Management  (18)
17. Physical Geography  (17)
18. Political Science, Public Administration  (15)
19. Engineering, Environmental  (14)
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著者 

1. Oregon State University  (37)
2. State University of New York College of Environmental Science and Forestry  (21)
3. University of Washington  (19)
4. University of California, Berkeley  (16)
5. The University of Wisconsin - Madison  (16)
6. West Virginia University  (15)
7. Stephen F. Austin State University  (14)
8. University of California, Davis  (13)
9. Mississippi State University  (13)
10. Yale University  (13)
11. University of Florida  (13)
12. University of Minnesota  (13)
13. Utah State University  (12)
14. North Carolina State University  (12)
15. Purdue University  (11)
16. University of Montana  (11)
17. University of Alberta (Canada)  (10)
18. University of Michigan  (9)
19. Michigan State University  (9)
20. Texas A&M University - Kingsville  (9)
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建立日期 

1. 之前1993  (10)
2. 1993到1997  (25)
3. 1998到2002  (75)
4. 2003到2008  (352)
5. 之後 2008  (160)
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語言 

1. 英文  (614)
2. 法文  (5)
3. Undetermined  (2)
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