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Sampling locations and land cover in eight study watersheds in the Great Lakes Basin. Map comprised of various spatial datasets: state and political boundaries (Instituto Nacional de Estadística Geografía e Informática, 2006a), hydrography (Instituto Nacional de Estadística Geografía e Informática, 2006b, National Atlas of the United States, 2005), land cover, and watershed boundaries (U.S. Department of Agriculture-Natural Resources Conservation Service (2009)).
