Some acanthoceratid ammonites from Upper Cenomanian (Upper Cretaceous) rocks of Wyoming / by William A. Cobban (U.S. Geological Survey professional paper ; 1353)
Some acanthoceratid ammonites from Upper Cenomanian (Upper Cretaceous) rocks of Wyoming / by William A. Cobban
(U.S. Geological Survey professional paper ; 1353)