Texas. Department of State Health Services. Texas EMS Magazine, Volume 19, Number 3, May/June 1998, periodical, May 1998; (https://texashistory.unt.edu/ark:/67531/metapth1507915/m1/1/: accessed May 29, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .

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