Midwest Ice Retreat

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Midwest Ice Retreat Maps from Dyke, A.S.,
Moore, A. Robertson, L. (2003). Deglaciation of
North America. Geological Survey of Canada Open
File, 1574. Thirty-two digital maps at
17 000 000 scale (two sheets) with accompanying
digital chronological database on CD with full
map series. http//geoscan.ess.nrcan.gc.ca/cgi-bi
n/starfinder/22108/geoscan_e.txt
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