1. Nonmarine mollusks of late Cretaceous Age from Wyoming, Utah and Colorado Author/Creator: Yen, Teng-Chien Publication/Creation: Washington : U.S. Govt. Print. Off, 1954 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 254. Access & Availability: Loading
2. Molluscan fauna of the Morrison Formation Author/Creator: Yen, Teng-Chien Publication/Creation: Washington : U.S. Govt. Print. Off, 1952 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 233 A-E. Access & Availability: Loading
3. Fresh-water mollusks of Cretaceous Age from Montana and Wyoming Author/Creator: Yen, Teng-Chien Publication/Creation: Washington : U.S. Govt. Print. Off, 1951 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 233 A-E. Access & Availability: Loading
4. Paleocene fresh-water mollusks from Southern Montana Author/Creator: Yen, Teng-Chien Publication/Creation: Washington : U.S. Govt. Print. Off, 1951 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 214. Access & Availability: Loading