Analytical Geological Map VI, Exposures of Successive orographic Disturbances
Geological Exploration of the Fortieth Parallel. Lakes of the Glacial Period.
Continent: North America
Country: United States
Sheet Size 11.5 x 17.5 inches
Publisher: Engineer Department US Army
VG+ condition with age toning, center fold as issued
Cartographer/Map Maker: Clarence King