2p6 REFERENCE LIST OF BOOKS 



Ridgway, R. 



Manual of North American Birds. 



Birds of North and Middle America. (Bulletin 50, U.S. National 



Museum.) 

 Swarth, H. S. 



Birds of the Huachuca Mountains. 



A Distributional List of the Birds of Arizona. 

 Willett, G. 



Birds of the Pacific Slope of Southern California. 



