Walter A. Lawrance Androscoggin River Studies Annual Report, November, 1957, Series I: Androscoggin River 1940-1983, Subseries I: Androscoggin River Studies, Box 3, Folder 1, Walter A. Lawrance Papers..
Walter A. Lawrance Androscoggin River Studies Annual Report, November, 1957, Series I: Androscoggin River 1940-1983, Subseries I: Androscoggin River Studies, Box 3, Folder 1, Walter A. Lawrance Papers, Edmund S. Muskie Archives and Special Collections Library, Bates College, Lewiston, Maine.