2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the glacial limit lines, with line decorations (added for display purposes) in the United States. This layer is part of t... Geological Survey (U.S.).
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2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the glacial limit lines in the United States. This layer is part of the Geologic Map of the United States, originally pub... Geological Survey (U.S.).