Michigan. Geological Survey DivisionBy C. A. Davis on peat. From Geological Survey of Michigan. Annual report for 1906. Plate XVI. Swamp areas shown in brown. 1 map: col.; 64 x 52 cm.JPEG973cb9be-5a19-44d8-98bd-e97a15f2249dengPublicMap of the original swamp areas of the lower peninsula of Michigan.: 1907. Compiled from John Farmer's map of 1873 for reportMapsMichigan1907University of Michigan