- Letter from Chase Putnam, Executive Director of the Warren County Historical Society, to John Marsh, 01/25/1978
- Letters between John Marsh and the Pennsylvania Farm Museum of Landis Valley, 09/05/1978 and 09/14/1978
- Letter from The Conneauttee Historical Society of Edinboro to The Public Committee for the Humanities in Pennsylvania, 09/26/1978
- Letter from John Marsh to J. Luther Snyder, Deputy Secretary of the Pennsylvania Department of Agriculture, 03/16/1979
