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

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Bahls, L.L. 1980. Salinity and The Structure of Benthic Algae 

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

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Bahls, L.L., Bob Bukantis, and Steve Tralles . 1992. Benchmark 



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