U.S. Geological Survey Open-File Report 2005-1249, Coastal Change-Potential Assessment of Sleeping Bear Dunes, Indiana Dunes, and Apostle Islands National Lakeshores to Lake-Level Changes, Figure 1.

Coastal Change-Potential Assessment of Sleeping Bear Dunes, Indiana Dunes, and Apostle Islands National Lakeshores to Lake-Level Changes
USGS Open-File Report 2005-1249

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Figure 1. Hydrographs of Lake Michigan-Huron (A) and Lake Superior (B) from 1918 - 2003, lake-level data provided by National Oceanic and Atmospheric Administration Great Lakes Environmental Research Laboratory (http://www.glerl.noaa.gov/)

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