Gannett, Henry, 1846-1914Geological Survey (U.S.)U.S. Geological Survey compiled by Henry Gannett. 1 map: col.; 43 x 71 cmJPEGf5b454cf-3f73-40db-a476-fb013675a0adengPublicUnited States contour mapMapsUnited States of AmericaApproximately 1896University of Michigan