Album caption: Gastropoda. Mollusca fauna of the Morrison Formation. Colorado and Wyoming. 1945. Published in U. S. Geological Survey. Professional paper 233-B. 1952.
Summary
Album caption: Gastropoda. Mollusca fauna of the Morrison Formation. Colorado and Wyoming. 1945.
Published in U. S. Geological Survey. Professional paper 233-B. 1952.
Available in the U.S. Geological Survey Denver Library Photographic Collection, Yen, Teng-Chien Collection
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