Edward P. Costigan (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Edward P. Costigan" in English language version.

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2books.google.com

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archive.org

Stone, Wilbur Fisk, ed. (1919). History of Colorado. Vol. IV. Chicago: S. J. Clarke Publishing Company. p. 145.

books.google.com

United States Congress (2005). Biographical Directory of the United States Congress, 1774–2005. Government Printing Office. p. 878. ISBN 978-0-16-073176-1.
Norris, Jim (2009). North for the Harvest: Mexican Workers, Growers, and the Sugar Beet Industry. Minnesota Historical Society. p. 46. ISBN 978-0-87351-746-1.