Sketch of the fort at Michilimackinac; Perks. Magra.; Title in margin: Magra map.
Relief shown by hachures and shading. Facsimile. "From the original in the Clements library." Reproduced from ms. original dated 1766? Oriented with north to the bottom. Includes index of buildings. 1 map: col.; 20 x 23 cm