Map size in jpg-format: 10.9559MiB
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Colorful map of the United States, exhibiting the geological regions, including Ecozoic, Silurian, Devonian and Lower Carboniferous, Coal Measures and Permo-Carboniferous, Triassic and Jurassic, Cretaceous, Tertiary, Alluvium and Volcanic, each coded by color.
From the first edition of Gray's Atlas.
O. W. Gray was a publishing firm based in Philadelphia. Later, they published as O. W. Gray & Son. They published atlases in the late nineteenth century. Gray's National Atlas was one of the most successful commercial ventures of the 1870s and one of the last to employ hand coloring on maps.
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