Texas. Department of State Health Services. Texas EMS Magazine, Volume 18, Number 1, January/February 1997, periodical, January 1997; (https://texashistory.unt.edu/ark:/67531/metapth1507926/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .

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