"Peter Jefferson and Joshua Fry, mapmakers."; "Elcan, Marcus C."; "Virginia--Maps.", "Maryland--Maps.", "New Jersey--Maps.", "North Carolina--Maps.", "Pennsylvania--Maps."; "Fry, Joshua.", "Jefferson, Peter."; "Cartographers--United States--Biography."; "Elcan, Marcus C."; "1962"; "Journal article tearout from: The Iron Worker, v.26:no.4 (1962:autumn)."; ""; "P7371"; "pec"; "Virginia--Maps.", "Maryland--Maps.", "Pennsylvania--Maps.", "Cartographers--United States--Biography.", "Jefferson, Peter.", "North Carolina--Maps.", "Fry, Joshua.", "New Jersey--Maps."; "14256"; .