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Ethel to Lester, Aug 16, 1936

Ethel to Lester, Aug 13, 1936

Ethel to Lester, Aug 10, 1936

Ethel to Lester, Aug 9, 1936

Ethel to Lester, Aug 4, 1936

Ethel to Lester, Aug 2, 1936

Ethel to Lester, July 27, 1936

Ethel to Lester, July 21, 1936

General Plan of Ashtabula Plant

Ethel to Lester, July 25, 1936

Section and Diagram Illustrating the Geology of the Region Between the Northern Shores of Lakes Superior and Michigan

Geological Map of the District Between Keweenaw Bay and Chocolate River, Lake Superior, Michigan