Center for Disease Control. Surveillance for Waterborne-Disease Outbreaks - United States, 1993-1994, text, April 12, 1996; (https://texashistory.unt.edu/ark:/67531/metadc804558/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .

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