Search Results for the EPA National Library Catalog

Items Found: 4

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Your Search: (AUTHOR=Hellenthal AND Ronald AND A.)

 
 
 

Select Item Title Year Published
A computerized system for the evaluation of aquatic habitats based on environmental requirements and pollution tolerance associations of resident organisms / 1987
A computerized system for the evaluation of aquatic habitats based on environmental requirements and pollution tolerance associations of resident organisms / 1986
Environmental Requirement and Pollution Tolerance Retrieval and Analysis System : user's guide (abridged) / 1985
General aquatic ecology, methods, environmental requirements and indicators, toxicology, and production 1983

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