Report of the Commission to locate the site of the frontier forts of Pennsylvania .. (1916)
Commission to Locate the Site of the Frontier Forts of Pennsylvania, Montgomery, Thomas Lynch, 1862- · Harrisburg, Pa., W.S. Ray, state printer · leaf 121
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Fortification · Indians of North America
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
