Autor:	Jewett, Stanley G., Christensen, Glen, Trelease, Thomas, Allen, Walter I., Sooter, Clarence A., Parmenter, Henry E., Alexander, Gordon, Stoner, Emerson A., Stager, Kenneth E., Sutton, George Miksch, Burleigh, Thomas D., Behle, William H., Cottam, Clarence, Test, Frederick H., Vogt, Julian
Zdroj:	The Condor, 1941 May 01. 43(3), 156-162.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/1364371 Zobrazit plný text záznamu