1. Nonmarine mollusks of late Cretaceous Age from Wyoming, Utah and Colorado Author/Creator: Yen, Teng-Chien, author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1954 Resource Type: Book Access & Availability: Loading
2. Molluscan fauna of the Morrison Formation Author/Creator: Yen, Teng-Chien, author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1952 Resource Type: Book Access & Availability: Loading
3. Fresh-water mollusks of Cretaceous Age from Montana and Wyoming Author/Creator: Yen, Teng-Chien, author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1951 Resource Type: Book Access & Availability: Loading
4. Paleocene fresh-water mollusks from Southern Montana Author/Creator: Yen, Teng-Chien, author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1948 Resource Type: Book Access & Availability: Loading