Search Results for the EPA National Library Catalog

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Showing: Items 601 - 650
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Oligohaline Areas in Tampa Bay Tributaries: Spatial Extent and Species Lists. 1992
Oregon, USA, ecological regions and subregions for water quality management / 1991
Ovarian Mycosis in the Topsmelt 'Atherinops affinis'. 1991
Overview of Case Studies on Recovery of Aquatic Systems from Disturbance. 1990
Para-tert-butyl Benzoic Acid: Acute Toxicity (salmo Gairdneri, Daphnia Magna and Selenastrum Capricornutum) and Octanol/water Partition Coef. W/letter. 1986
Parasites of freshwater fish. I, Fungi. 1963
Parasites of North American freshwater fishes 1999
Pathogenic Naegleria : distribution in nature / 1979
Pathways of trace elements in Arctic lake ecosystems : progress report to the Atomic Energy Commission for the period 15 April 1970 through 14 April 1971 / 1971
Pathways of trace elements in Arctic lake ecosystems; 1970
Patterns in freshwater fish ecology / 1998
Patuxent River Basin : environmental assessment of stream conditions / 1998
Pennak's freshwater invertebrates of the United States : Porifera to Crustacea / 2001
Pentabromodiphenyl Oxide (PeBDPO): A 96-Hour Flow-Through Acute Toxicity Test with the Rainbow Trout (Oncorhynchus Mykiss), with Cover Letter dated 10/29/1997. 1997
Periphyton communities in streams of the Ozark plateaus and their relations to selected environmental factors 2003
Periphyton of freshwater ecosystems : proceedings of the First International Workshop on Periphyton of Freshwater Ecosystems, held in V axj o, Sweden, 14-17 September 1982 / 1983
Perspectives on nonpoint source pollution : proceedings of a national conference, Kansas City, Missouri, May 19-22, 1985. 1985
Pesticides and freshwater fauna, 1971
Peterson field guide to freshwater fishes of North America north of Mexico / 2011
Pharmacological testing of blue-green algae for constituents having therapeutic value / 1970
Phosphorus cycling in a periphyton-dominated freshwater wetland / 1997
Phosphorus in freshwater ecosystems proceedings of a symposium held in Uppsala, Sweden, 25-28 Sept. 1985 / 1988
Photosynthetic pigments of Lake Superior periphyton and their relation to primary productivity, 1970
Phycoperiphyton responses to the discharge of fish hatchery effluents in two eastern Sierra Nevada streams 1976
Physical, chemical and bacteriological water quality in Gunpowder Falls and Little Gunpowder Falls : 1965 summer survey/ 1967
Physical, chemical, and biological data for selected streams in Chester County, Pennsylvania, 1969-80 1989
Physicochemical Factors Affecting Toxicity in Freshwater: Hardness, pH, and Temperature (Chapter 1). 1994
Phytoplankton and trophic gradients : proceedings of the 10th workshop of the International Association of Phytoplankton Taxonomy & Ecology (IAP), held in Granada, Spain, 21-29 June 1996 / 1998
Phytoplankton and zooplankton composition, abundance and distribution : Lake Erie, Lake Huron, and Lake Michigan - 1983 / 1987
Phytoplankton and zooplankton composition, abundance and distribution and trophic interactions : offshore region of Lakes [i.e. Lake] Erie, Lake Huron and Lake Michigan : 1985 / 1989
Phytoplankton and zooplankton in Lakes Erie, Lake Huron and Lake Michigan, 1984 / 1988
Phytoplankton dynamics in the North American Great Lakes / 1996
Phytoplankton growth and chlorophyll levels in the Sacramento-San Joaquin delta through San Pablo Bay / 1977
Phytoplankton productivity : carbon assimilation in marine and freshwater ecosystems / 2002
Phytoplankton succession from 1968 to 1990 in the subarctic Lokka reservoir = Yhteenveto : Kasviplanktonin kehitys vuosina 1968-1990 subarktisessa Lokan tekoaltaassa / 1995
Phytoplankton water quality relationships in U.S. lakes / 1979
Pilot study for Montgomery County and Maryland DNR data integration : comparison of benthic macroinvertebrate sampling protocols for freshwater streams / 2003
Pilot study to evaluate biological, physical, chemical, and land-use characteristics in Maryland coastal plain streams 1993
Pilot study to evaluate biological, physical, chemical, and land-use characteristics in Maryland coastal plain streams : year 2 / 1995
Plankton analysis : training manual / 1975
Plankton analysis : training manual. 1970
Plankton community and hydraulic characterization preliminary to lake flushing / 1969
Plankton micro-fossils as indicators of paleotrophic dynamism in Flathead Lake : completion report, project no. A-074-MONT / 1975
Planned and actual impacts on fish and water quality on {i.e. in} three national forests in northern Idaho 1987
Pollution ecology of freshwater invertebrates. 1974
Pond littoral ecosystems : structure and functioning : methods and results of quantitative ecosystem research in the Czechoslovakian IBP wetland project / 1978
Population, water & wildlife : finding a balance / 2002
Potential for Transfer of Polynuclear Aromatic Hydrocarbons from Contaminated Fish (progress Report) with Cover Letter dated 021286 & Epa Acknowlegement Letter. 1986
Pre-impoundment study of the North Anna River, Virginia 1972
Predation and freshwater communities 1980
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