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United States Environmental Protection Agency
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Search Results for the EPA National Library Catalog
Items Found: 957
Showing: Items 451 - 500
Your Search: (SUBJECT=FRESHWATER.)
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Harmful algae 2002 : proceedings of the Xth International Conference on Harmful Algae, St. Pete Beach, Florida, USA, October 21-25, 2002 /
Harmful algae = Algas nocivas : proceedings of the VIII International Conference on Harmful Algae, Vigo Spain, 25-29 June 1997 /
Health effects criteria for fresh recreational waters /
Heterotrophic Bacteria of the Freshwater Neuston and Their Ability to Act as Plasmid Recipients under Nutrient Deprived Conditions.
Hexabromocyclododecane (HBCD): A 96-Hour Flow-Through Acute Toxicity Test with the Rainbow Trout (Oncorhynchus Mykiss), with Cover Letter dated 06/27/1997. Final Report.
Historical changes in large river fish assemblages of the Americas
Historical overview of the freshwater inflow and sewage treatment plant discharges to the Potomac River estuary with resultant nutrient and water quality trends
How to know the aquatic plants
How to know the aquatic plants /
How to know the aquatic plants /
How to know the fresh-water algae; an illustrated key for identifying the more common fresh-water algae to genus, with hundreds of species named and pictured and with numerous aids for their study
How to know the fresh-water algae; an illustrated key for identifying the more common fresh-water algae to genus, with hundreds of species named pictured and with numerous aids for their study.
How to know the freshwater algae /
How to know the freshwater Crustacea
How to know the freshwater fishes /
How to know the freshwater fishes : pictured-keys for identifying all of the freshwater fishes of the United States, and also including a number of marine species which often enter freshwater /
Hydrobiological studies on some Danish ponds and lakes. Part II: The quotient hypothesis and some new or little known phytoplankton organisms.
Identification of freshwater diatoms from live material
Illustrated guide to aquatic macroinvertebrates
Illustrations of Fresh Water Algae Toxic to Animals.
Impact of Freshwater Flow Variations in the Manatee River.
Impact of urbanization on the hydrology of Pocono Creek Watershed a model study / [electronic resource] :
Impacts of coalmine discharges on Illinois Unionid mussels /
Imperiled waters, impoverished future : the decline of freshwater ecosystems /
Impervious surface area and benthic macroinvertebrate response as an index of impact from urbanization on freshwater wetlands /
Impervious Surface Area and Benthic Macroinvertebrate Response as an Index of Impact from Urbanization on Freshwater Wetlands.
Impervious surface area and benthic macroinvertebrate response as an indicator of impact from urbanization of freshwater wetlands /
Improving water quality by removal of pesticide pollutants with aquatic plants
In Vitro Evaluation of HFC-125 for Chromosome Aberrations in Human Lymphocytes, with Cover Letter dated 03/20/1991. (Sanitized).
Indicators for waterborne pathogens /
Induction of Nitric Oxide Synthase in Channel Catfish 'Ictalurus punctatus' by 'Edwardsiella ictaluri'.
Industrial wastes : effects on Trinity River ecology, Fort Worth, Texas /
Influence of hydrologic loading rate on phosphorus retention and ecosystem productivity in created wetlands
Influence of low pH on electrolytes and interrenal histochemistry in brook trout (Salvelinus fontinalis) /
Influences of strip mining on the hydrologic environment of parts of Beaver Creek basin, Kentucky, 1955-66.
Initial Submission: 4-Day Static Aquatic Toxicity Studies with Jaguar C-13 in Rainbow Trout and Bluegills with Cover Letter dated 09/04/1992.
Initial Submission: 96-Hour LC50 to Bluegill Sunfish with Lead, Tetraethyl with Cover Letter dated 10/15/1992.
Initial Submission: Acute Aquatic Effects of 4-Aminophenol with Cover Letter Dated 09/08/1992.
Initial Submission: Acute Aquatic Toxicity Info for Luviquat HM 552 (Copolymer of Vinylimidazolium Chloride and Vinylpyrrolidone in Water) Submitted as a Letter Dated 10/01/1993.
Initial Submission: Acute Toxicity of Santoflex 13 in Fathead Minnows with Cover Letter dated 08/14/1992.
Initial Submission: Acute Toxicity of TCC in Bluegill at 15 degrees Celsius with Cover Letter dated 08/14/1992.
Initial Submission: Acute Toxicity of TCC in Bluegill at Dilution Water with a pH of 8.0 with Cover Letter dated 08/14/1992.
Initial Submission: Acute Toxicity of TCC in Bluegill at Dilution Water with a Total Hardness of 250 MG/L with Cover Letter dated 08/14/1992.
Initial Submission: Acute Toxicity of TCC in Bluegill with Cover Letter dated 08/14/1992.
Initial Submission: Acute Toxicity of TCC to Fathead Minnows with Cover Letter dated 08/14/1992.
Initial Submission: Acute Toxicity Study of ACL 60 in Rainbow Trout and Bluegills with Cover Letter Dated 08/14/1992.
Initial Submission: An Assessment of the Environmental Chemistry and Aquatic Toxicology of Trialkyltin Compounds with Cover Letter dated 09/29/1992.
Initial Submission: Basic Toxicity of 4-Methoxy-1-Naphthol with Cover Letter dated 09/08/1992.
Initial Submission: Basic Toxicity of Chloroacetone with Cover Letter dated 09/01/1992.
Initial Submission: Basic Toxicity of Methanesulfonyl Chloride with Cover Letter dated 08/26/1992.
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