title: North central states learn the value of cooperation.
authors: R
authors: R
authors: Crane
mesh_terms: D000401:Aircraft / Q000592:standards*; D000552:Ambulances; D004636:Emergency Service, Hospital / Q000458:organization & administration*; D007373:Interinstitutional Relations; D015146:Midwestern United States; D012952:Societies / Q000458:organization & administration*