Thayer, J. E. 1906. Eggs and nests of the Thick- 

 biUed Parrot. Auk 23:223-225. 



Urban, E. 1959. Birds from Coahuila, Mexico. U. 

 of Kansas Pubis. Mus. Nat. Hist. 11:443-516. 



Vincent, J. 1967. Red Data Book. Vol. 2. Survival 

 Services Commission lUCN Morges, Switzer- 

 land. 



Vorhies, C. T. 1934. Arizona records of the Thick- 

 billed Parrot. Condor 36:180-181. 



Wetmore, A. 1935. The Thick-billed Parrot in 

 southern Arizona. Condor 37:18-21. 



