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boulders	1
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Spencer, J W (1851-1921)	1
Spencer, J. W	1

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The high continental elevation preceding the Pleistocene period; Ancient shores, boulder pavements, and high-level gravel deposits in the region of the Great Lakes

Spencer, J W (1851-1921); Spencer, J W (1851-1921)

[1889]

Reprinted from the Bulletin of the Geological Society of America, vol. I, 1889.