scholarly article published in The Auk, April 1903

scholarly article published in The Auk, April 1904

article by R. E. Snodgrass

scientific article published in 1898

New York: Smithsonian Institution Series, Inc., 1930.

San FranciscoCalifornia Academy of Sciences1899

scholarly article published in The Auk, October 1903

Washington, D. C., The Academy, 1905.

article published in 1902

scholarly article published in The Auk, October 1902

scientific article published in 1903

Washington, D.C.: G.P.O., [1910]

Washington, 1909.