Southwestern United States (English Wikipedia)

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Byrkit, James W. (1992). Wilder, Joseph Carlton (ed.). "Land, Sky, and People: The Southwest Defined". University of Arizona. Retrieved June 13, 2018. The coordinates 104°–117° West Longitude and 29°–39° North Latitude constitute the boundaries of this region
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asu.edu

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Sheridan, T.E. (2012). Arizona: A History, Revised Edition. Southwest Center Series. University of Arizona Press. ISBN 978-0-8165-9954-7. Retrieved June 2, 2023.
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Weniger, D. (1969). Cacti of the Southwest: Texas, New Mexico, Oklahoma, Arkansas, and Louisiana. Elma Dill Russell Spencer Foundation Series. University of Texas Press. p. 14. ISBN 978-0-292-70000-0. Retrieved June 2, 2023.

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