title: 1991 almanac. EMS in the United States: a survey of providers in the 200 most populous cities.
authors: G
authors: G
authors: Cady
mesh_terms: D004181:Directories as Topic; D004632:Emergency Medical Services / Q000706:statistics & numerical data*; D011795:Surveys and Questionnaires; D014481:United States; D014505:Urban Population