"A Half century of oil-company road maps."; "Ristow, Walter W. (Walter William), 1908-2006."; "Petroleum industry and trade--Maps."; "Ristow, Walter W. (Walter William), 1908-2006."; "1964"; "Journal article reprint from: Surveying and Mapping, v.24:no.4 (1964:Dec.)."; ""; "P9370"; "pec"; "Petroleum industry and trade--Maps."; "14256"; .