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American Ornithologists Union. Check List of North American Birds. Third 
    Edition. New York, 1910.

Bailey, Vernon. A Biological Survey of North Dakota. U. S. Dept. of Agri. 
    Bureau of Biological Survey. North American Fauna No. 49, December, 1926.

Coues, Elliott, An account of the various publications relating to the travels 
    of Lewis & Clark, with a commentary on the Zoological results of their 
    expedition. Dept. of the Interior. U. S. Geological & Geographical Survey 
    of the Territories. Washington, D. C., February 8, 1876.

Coues, Elliott, History of the Expedition under the Command of Lewis & Clark. 
    Francis P. Harper, New York, 1893. (A new edition of the Biddle text.)

Hosmer, J. K., Gass' Journal of the Lewis & Clark Expedition. A. C. McClurg Co. 
    Chicago, 1904.

Quaife, Milo M., The Journals of Meriwether Lewis and Sergeant John Ordway. 
    Wisconsin Historical Society Collections. Vol. 22, Madison, 1916.

Thwaites, Reuben Gold, Original Journals of the Lewis & Clark Expedition, 
    1804-1806. Dodd, Mead & Co., New York, 1904.

Wilson, Alexander, American Ornithology. 3 Vols. J. W. Bouton, New York, 1877.