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A plant-based index of biological integrity(IBI)for headwater wet-lands in central Pennsylvania. Miller SJ,Wardrop DH,Mahaney WM,et al. Ecological Indicators . 2006
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Exotic plant speciesof the St Lawrence River wetlands:A spatial and historicalanalysis. Lavoie C,Jean M,Delisle F,et al. Journal of Biogeography . 2003