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Bahls, L.L. 1979. Benthic diatom diversity as a measure of 

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Bahls, L.L. 1993. Periphyton Bioassessment Methods for Montana 

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Bahls, L.L. 1999. Effects Of An Oil Spill on The Composition 

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Bahls, L.L., E.E. Weber, and J. 0. Jarvie . 1984. Ecology and 

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