title: Mid-year report.
authors: H M
authors: HM
authors: Collett
mesh_terms: D000401:Aircraft / Q000706:statistics & numerical data*; D000552:Ambulances / Q000706:statistics & numerical data*; D003625:Data Collection; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D007221:Industry / Q000706:statistics & numerical data; D014481:United States