See also National Register of Historic Places listings in Waldo County, Maine List of National Historic Landmarks in Maine Seacoast defense in the United States References Bibliography External links Fort Knox State Historic Site Department of Agriculture, Conservation and Forestry Friends of Fort Knox web site The Fort Knox Roll Book Website Knox American Civil War museums in Maine Museums in Waldo County, Maine Military and war museums in Maine Penobscot River Maine in the American Civil War Maine state historic sites Knox National Historic Landmarks in Maine National Register of Historic Places in Waldo County, Maine Granite buildings