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Refined by: Part of: Historic American Buildings Survey/Historic American Engineering Record/Historic American Landscapes Survey Remove Available Online Remove Contributor: Macdonald, Thomas H Remove Contributor: Bureau of Public Roads Remove Contributor: Historic American Engineering Record Remove Part of: American Memory Remove Subject: Keystones Remove Subject: Civil Engineering Remove Part of: Prints and Photographs Division Remove Contributor: Jurale, James Remove Contributor: Grogan, Brian C Remove