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This Thesis is brought to you for free and open access. It has been accepted for inclusion in Dissertations and Theses by an authorized administrator of PDXScholar. For more information, please contact pdxscholar@pdx.edu. Recommended Citation Salmon, John J., "Polychlorinated biphenyls: uptake by Daphnia and residues in crayfish from the Willamette River" (1972). Dissertations and Theses. Paper 966.