http://pec.lib.wvu.edu/record/P73711962Peter Jefferson and Joshua Fry, mapmakers.Journal article tearout from: <em>The Iron Worker</em>, v.26:no.4 (1962:autumn).Elcan, Marcus C.Virginia--Maps.Cartographers--United States--Biography.New Jersey--Maps.North Carolina--Maps.Fry, Joshua.Maryland--Maps.Jefferson, Peter.Pennsylvania--Maps.14256