Imlay, Ralph Willard 1908-1989 Some Jurassic ammonites from Central Saudi Arabia / by Ralph W. Imlay. -- Washington : United States Government Printing Office, 1970 - 15 p., [4] h. de lam. -- (Geological Survey Professional Paper ; 643-D). Subjects--Topical Terms: AmonitesArabia SaudíJurásico Universal Decimal Class. No.: 564.53(532)"6152"