"Geological Map of the United States Compiled by C.H. Hitchcock and W. P. Blake…", Hitchcock, Charles Henry

This is the second edition of Hitchcock important geological map of the United States. In addition to the geology, the large and colorful map depicts railroads, roads, canals, army arsenals and forts. A table at lower left provides an explanatory key to the colors used to indicate the nine distinct geological types. Lithographed by Julius Bien.

References: Marcou & Marcou #67.

Condition: B+

Issued folding with a few short splits at fold intersections, minor foxing, and a short edge tear at right that has been closed on recto with cello tape that does not impact the map image.