A History of North American Birds; Land Birds; Vol. 2 of 3 - Spencer Fullerton Baird; T. M. Brewer; Robert Ridgway - Page №506

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3. Picus nuttalli. ♂ Cal., 4482.

4. Picus scalaris. ♂ Texas, 46804.

5. Picus scalaris. ♀ Texas, 9933.