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主題 

1. Environmental sciences  (3,354)
2. Engineering, Environmental  (491)
3. Biology, Ecology  (340)
4. Urban and Regional Planning  (224)
5. Geography  (195)
6. Biogeochemistry  (160)
7. Economics, General  (156)
8. Hydrology  (148)
9. Engineering, Civil  (116)
10. Agriculture, Soil Science  (115)
11. Physics, Atmospheric Science  (109)
12. Political Science, general  (101)
13. Recreation  (100)
14. Economics, Agricultural  (88)
15. Biology, Microbiology  (86)
16. Energy  (84)
17. Remote sensing  (81)
18. Geochemistry  (66)
19. Biology, Oceanography  (64)
20. Chemistry, Analytical  (59)
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著者 

1. University of California, Berkeley  (100)
2. University of Michigan  (66)
3. Stanford University  (63)
4. The University of Wisconsin - Madison  (49)
5. Michigan State University  (45)
6. University of Guelph (Canada)  (37)
7. University of California, Davis  (35)
8. George Mason University  (34)
9. The Ohio State University  (34)
10. University of Minnesota  (33)
11. University of Toronto (Canada)  (31)
12. University of Florida  (31)
13. Harvard University  (30)
14. University of Waterloo (Canada)  (29)
15. University of Illinois at Urbana-Champaign  (29)
16. The University of North Carolina at Chapel Hill  (29)
17. Yale University  (29)
18. State University of New York College of Environmental Science and Forestry  (26)
19. University of Washington  (26)
20. Royal Roads University (Canada)  (23)
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建立日期 

1. 之前1992  (21)
2. 1992到1999  (233)
3. 2000到2007  (1,892)
4. 2008到2016  (903)
5. 之後 2016  (363)
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語言 

1. 英文  (3,393)
2. 西班牙文  (7)
3. 法文  (3)
4. Undetermined  (3)
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