A History of North American Birds; Land Birds; Vol. 2 of 3 - Spencer Fullerton Baird; T. M. Brewer; Robert Ridgway - Page №343

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5. Pyrocephalus mexicanus. ♂ Mex., 38206.

6. Empidonax obscurus. ♂ Nevada, 53294.

7. Empidonax hammondii. ♂ Nevada, 53305.