Excerpt from The Journal of Geology, Vol. 5: July-August, 1897, Moraines of Recession and Their Significance in Glacial Theory

The Glacial Lake Agassiz, by warren upham, Monograph XXV, U. S. Geological Survey, 1896, pp. 139 - 141. Also, Twenty-second Ann. Rept. Minn. Geol. Survey, Part III, 1894, p. 45.

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