This large and very colorful thematic map is the first edition that, according to Marcou & Marcou, was dated 1874 but some "copies dated 1872…were privately distributed." This is one of those scarce examples. It identifies railroads, roads, canals, army arsenals, forts and much more. A table at lower left provides an explanatory key to the colors used to indicate nine distinct geological formations. The carefully drawn map shows good geographical detail as well as the remarkable geological information. The geography of the map is from the War Department's "Military Map of the United States," used by permission of the Chief of Engineers. A seldom seen derivative of Hitchcock's standard map.

References: Marcou & Marcou #70; Phillips (A) 1330

Condition: B+

Folding as issued on thick paper with very strong original hand coloring. A couple spots with more visible along folds on verso, but not visible from front. One fold with small split at intersection, otherwise very good to fine.