Canfield, Ruth E.2017-09-152017-09-151926http://hdl.handle.net/10829/7996Ruth Canfield wrote and asked Binns for a ball mill cover. She also spoke of her work in Silvermine Connecticut.4 pagesen-USCanfield, Ruth Ella, 1896-1993Binns, Charles Fergus, 1857-1934Ball mill coverMr. GutmannSilvermine, ConnecticutLetter from Ruth E. Canfield to Charles F. Binns, circa 1926?Correspondence