1993 annual transport statistics and transport charges survey.
Mayfield
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Emergency Care Information Center, Carlsbad, CA.
D017732:Air Ambulances / Q000191:economics / Q000706:statistics & numerical data*; D003625:Data Collection; D004632:Emergency Medical Services / Q000191:economics / Q000706:statistics & numerical data*; D005249:Fees and Charges / Q000706:statistics & numerical data*; D014481:United States