Search Results for the EPA National Library Catalog

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

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Select Item	Title	Year Published
1	A computerized system for the evaluation of aquatic habitats based on environmental requirements and pollution tolerance associations of resident organisms /	1987
2	A computerized system for the evaluation of aquatic habitats based on environmental requirements and pollution tolerance associations of resident organisms /	1986
3	Environmental Requirement and Pollution Tolerance Retrieval and Analysis System : user's guide (abridged) /	1985

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