Gidley, James Williams, 1866-1931. Fossil Proboscidea and Edentata of the San Pedro valley, Arizona / by James Williams Gidley.

Gidley, James Williams, 1866-1931.

Fossil Proboscidea and Edentata of the San Pedro valley, Arizona / by James Williams Gidley.

Washington, D.C. : Govt. Print. Off., 1926.

Cover title.

Includes bibliographical references.

Paleontology -- Arizona.

Vertebrates, Fossil.

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