1990 AAMS (Association of Air Medical Services) financial survey. Part I: Air transport charges.
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D000401:Aircraft / Q000191:economics*; D000552:Ambulances / Q000191:economics*; D005249:Fees and Charges / Q000706:statistics & numerical data*; D005843:Geography; D006761:Hospitals; D011795:Surveys and Questionnaires; D014481:United States