A History of North American Birds; Land Birds; Vol. 2 of 3 - Spencer Fullerton Baird; T. M. Brewer; Robert Ridgway - Page №344

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8. Empidonax traillii. ♂ Pa., 1025.

9. Empidonax pusillus. ♂ Cal., 41517.

10. Empidonax minimus. ♂ Pa., 2649.