found: Exploring the West from Monticello, 1995: t.p. (William R. Irwin) p. vi (Bill Irwin, historian)
found: DE 2-19-96
found: The new Niagara, 1996: CIP t.p. (William Irwin)
found: William R. Irwin: The new Niagara, viewed Feb. 17, 2006 (William R. Irwin; William Irwin; born and raised in Buffalo, N.Y.; historian by training; has taught at universities in the United States and South Africa)
found: Digital dissertations, Feb. 17, 2006 (Irwin, William R., Ph. D., University of Virginia, 1991--The new Niagara)
found: U.S. copyright file, Feb. 17, 2006 (Irwin, William R., 1958- )