Texas. Department of Health. Bureau of Emergency Management. EMS Messenger, Volume 10, Issue 1, January 1989, periodical, January 1989; (https://texashistory.unt.edu/ark:/67531/metapth1507871/m1/1/: accessed June 7, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .

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