Autor:	Carter, Frances, Lewis, Harrison F., Hardy, Ross, Wiggins, Ira L., Wiggins, Bruce L., Moffitt, James, Cowan, Ian McTaggart, Hawbecker, Albert C., Sefton,, J. W., Hand, R. L., Jewett, Stanley G., Dille, Fred M., Borell, A. E., Willett, G., Nichols, Walter F.
Zdroj:	The Condor, 1939 Mar 01. 41(2), 79-87.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/1363963 Zobrazit plný text záznamu