West coast shells. A description of the principal marine mollusks living on the west coast of the United States, and of the land shells of the adjacent region - Keep, Josiah,; Hannibal, Harold Briggs. (San Francisco, The Whitaker & Ray-Wiggin Company, 1911)
https://www.biodiversitylibrary.org/bibliography/13101
Keywords: Mollusks|West (U.S.)|