Annual aircrew survey.
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Cady
D017732:Air Ambulances / Q000706:statistics & numerical data*; D003625:Data Collection; D004634:Emergency Medical Technicians / Q000191:economics / Q000193:education / Q000706:statistics & numerical data*; D011361:Professional Competence; D012449:Safety; D012456:Salaries and Fringe Benefits / Q000706:statistics & numerical data*; D014481:United States