Texas. Department of Health. Bureau of Emergency Management. Texas EMS Messenger, Volume 12, Number 7, August 1991, periodical, August 1991; (https://texashistory.unt.edu/ark:/67531/metapth1624608/m1/1/: accessed June 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .

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