Johnson and WardPrime meridians at Greenwich and Washington. Includes view of Straits of Mackinaw. Probably detached from an atlas by Alvin J. Johnson, no. 45-46. In upper left margin: 45. In upper right margin: 46. 1 map: hand colored; 44 x 57 cm.JPEG6ff5e553-a1c1-4ead-b6d7-7ca35e2bc2e1engPublicJohnson's Michigan and Wisconsin; by Johnson and Ward.MapsUnited States of America1862?University of Michigan