Texas. Department of State Health Services. Texas EMS Magazine, Volume 13, Number 3, April 1992, periodical, April 1992; (https://texashistory.unt.edu/ark:/67531/metapth1507890/m1/1/: accessed June 9, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .

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