1. Jurassic ammonites from southern Alaska Author/Creator: Imlay, Ralph W. 1908-1989. (Ralph Willard) Publication/Creation: [Washington, D.C.] : [U.S. G.P.O.], [1962-1964] Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 418-421. Access & Availability: Loading