Fresh-water mollusks of Cretaceous Age from Montana and Wyoming Yen, Teng-Chien creator author. Geological Survey (U.S.) issuing body. text bibliography dcu 1951 monographic eng remote 1 online resource (iii, 20 pages, 2 pages of plates). Part 1: A fluviatile fauna from the Kootenai formation near Harlowton, Montana -- Part 2: An Upper Cretaceous fauna from the Leeds Creek area, Lincoln County, Wyoming. by Teng-Chien Yen. Title from title screen (viewed September 29, 2014). Includes bibliographical references and index. n-us-mt n-us-wy Gastropoda, Fossil Mollusks Montana Mollusks Wyoming Paleontology Cretaceous Paleontology Wyoming Lincoln County Cretaceous Geologic Period Gastropoda, Fossil Mollusks Paleontology Montana Wyoming Wyoming Lincoln County From 65 to 140 million years ago fast I 19.16:233-A I 19.16:233-A Fresh-water mollusks of Cretaceous Age from Montana and Wyoming Yen, Teng-Chien. (OCoLC)2703711 Geological Survey professional paper ; 233-A Shorter contributions to general geology https://purl.fdlp.gov/GPO/gpo85156 COP 140929 20211120182554.0 in00003908716 eng