Communications survey.
Larsen
B
B
D000401:Aircraft / Q000706:statistics & numerical data*; D004631:Emergency Medical Service Communication Systems / Q000706:statistics & numerical data* / Q000639:trends; D004634:Emergency Medical Technicians / Q000706:statistics & numerical data; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data / Q000639:trends; D011795:Surveys and Questionnaires; D014481:United States