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- the Southwestern Frontier. University of Texas Press. p. 80. ISBN 978-0-292-77441-4. "History." U.S. Army Corps of Engineers - San Francisco District...7 KB (756 words) - 05:58, 31 January 2024
- the Southwestern Frontier. University of Texas Press. p. 54. ISBN 978-0-292-77441-4. "BBC - History: British History Timeline". www.bbc.co.uk. Retrieved...48 KB (4,854 words) - 17:52, 13 May 2024