Mcspadden, J. Walker 1874-1960 How they blazed the way : men who have advanced civilization / by J. Walker Mcspadden - New York : Dodd, Mead, c1960 - xi, 284 p. : ill., plates ; 21 cm. Includes index ISBN: USD 4.00 Subjects--Topical Terms: Scientists--BiographyInventors--Biography Dewey Class. No.: 925