Gray's Geological Map of the United States. By Prof. Charles H. Hitchcock. Ph. D.

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Lithograph, hand-colored in outline by Gray, Frank, published 1882 by O.W. Gray & Son, Philadelphia. Image size: 400 by 633mm (15 by 25 inches). From Gray's Atlas — one of the most important American commercial atlases of the post-Civil War era. Frank A. Gray was an American cartographer working in the 1870s and 1880s for the Philadelphia-based firm O.W. Gray & Son, one of the leading commercial map publishers of the post-Civil War United States. Founded by Ormando Willis Gray, a civil and topographical engineer, the firm produced Gray's Atlas of the United States and its many regional successors. Gray's National Atlas was among the most successful commercial atlas ventures of the 1870s and one of the last American atlases to employ hand-coloring. The state maps of the 1880s are noted for their excellent topographical detail, clear depiction of the expanding railroad network, and accurate county boundaries — invaluable primary sources for historians and sought-after collector pieces today. This beautifully colored antique map shows nine different geological classifications, each identified in a key at lower left. The title is engraved above the map. Dr. Charles H. Hichkock, professor of geology at the Dartmouth College has drawn this interesting geological map. In excellent condition.

Gray, Frank – Gray's Geological Map of the United States. By Prof. Ch... · Antique Map, Lithograph · 400 x 633mm · O.W. Gray & Son, Philadelphia 1882