EarthWorks Geospatial Catalog

Preliminary geologic map of Maine 1933 [cartographic material] / by Arthur Keith.

"Information on south-central Maine furnished in 1931 and 1932 ... Assistance rendered in 1932 ... in northern and northwestern Maine ... Material gathered (1925-1931) ... for U. S. Geological Survey map ... Material published by the U. S. Geological Survey, mainly in the Eastport, Penobscot Bay, and Portland regions." "Base map by U. S. Geological Survey."
A. Hoen
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