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Pollution
1,562
Water
1,461
Environmental protection
1,295
Air
827
Water quality
789
Ecology
681
United States
661
Sewage
568
Ecology Research
537
Pesticides
528
Groundwater
462
Hazardous wastes
442
Drinking water
309
Water Pollution
242
Air Pollution
209
1970-1979
8,221
1980-1989
4,148
1990-1999
3,461
1980
1,154
1972
1,120
1979
1,059
1976
1,044
1978
1,002
1977
926
1973
852
2000-2009
792
1974
779
1975
663
1981
577
1900
569
1900-1909
569
1990
500
1971
491
1991
446
1995
423
1994
406
1989
399
1992
377
1982
340
1985
336
1984
320
1993
317
1983
306
1970
285
1998
271
Book
13,055
Serial
4,316
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4,089
Conference
851
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223
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192
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18
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16
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4
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3
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1
Audio CD
1
University of California
5,025
University of Michigan
3,223
Cornell University
1,530
University of Minnesota
1,467
Northwestern University
1,157
U.S. Environmental Protection Agency publications
Publications produced by the U.S. Environmental Protection Agency. This collection is updated as items are added to the HathiTrust repository.