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Pellston Environmental Workshop (6th : 1984 : Florissant, Colo.)
ScienceDirect https://www.sciencedirect.com/science/book/9780080348667
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International Symposium on River Ecology and the Impact of Man (1971 : University of Massachusetts)
ScienceDirect https://www.sciencedirect.com/science/book/9780125244503
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