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Pimentel, David, Lori Lach, Rodolfo Zuniga, and Doug Morrison. 1999. Environmental and economic costs associated with non-indigenous species in the United States. (June 12). Ithaca, NY: College of Agriculture and Life Sciences, Cornell University.
"In this article, we assess as much as possible the magnitude of the environmental impacts and economic costs associated with the diverse non-indigenous species that have become established within the United States. Although species translocated within the United States can also have significant impacts, this assessment is limited to non-indigenous species that did not originate within the United States or its territories."* (*excerpted from abstract
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