1. EMS in the United States: A survey of providers in the 200 most populous cities;Keller;J Emerg Med Serv,1990
2. Characteristics of midsized urban EMS systems;Braun;Ann Emerg Med,1990
3. Cardiac arrest and resuscitation: A tale of 29 cities;Eisenberg;Ann Emerg Med,1990
4. Quality assurance: Is it possible?;Eisenberg,1987
5. The use of advanced procedures on presumptively defined basic life support ambulance responses;Overton,1989