Old Block House Fort Mackinac and harbor, Mackinac Island, Michigan, In album prepared by Detroit Photographic Co. to use as a catalog in its office., Detroit Publishing Co., no. 53430., Gift; State Historical Society of Colorado; 1955, Blockhouses. , United States, Michigan, Mackinac Island.

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Photo credit: © piemags/LCB / Alamy / Afripics
License: Licensed
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Keywords: ., blockhouses., island., states--michigan--mackinac, united