Use of airframe and avionics options reaches all-time high.
Collett
H M
HM
D000401:Aircraft / Q000295:instrumentation*; D000552:Ambulances / Q000706:statistics & numerical data*; D003625:Data Collection; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data; D005069:Evaluation Studies as Topic; D013672:Technology / Q000639:trends*; D014481:United States