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      <marc:subfield code="a">Guidance document on application and interpretation of single-species tests in environmental toxicology.</marc:subfield>
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      <marc:subfield code="a">Ottawa : </marc:subfield>
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      <marc:subfield code="a">"December 1999."</marc:subfield>
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      <marc:subfield code="a">"Environmental Protection Series."</marc:subfield>
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      <marc:subfield code="a">"This intent of this document is to provide guidance on using and interpreting single-species toxicity tests for protecting the environment. It focuses on the toxicity tests published by Environment Canada, and supplements the other documents of that department, which deal with sampling, testing, and analyses. Aquatic tests receive most emphasis because they are in more frequent use, but tests with sediments and soil also receive coverage. Both lethal and sublethal tests are included"--Abstract.</marc:subfield>
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      <marc:subfield code="a">Environmental Science and Technology Centre (Canada). </marc:subfield>
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