From the Centers for Disease Control and Prevention. Use of rollover protective structures--Iowa, Kentucky, New York, and Ohio, 1992-1997.
D000062:Accidents, Occupational / Q000517:prevention & control* / Q000706:statistics & numerical data; D000383:Agriculture; D006801:Humans; D007629:Kentucky / Q000453:epidemiology; D018986:Motor Vehicles; D009518:New York / Q000453:epidemiology; D009820:Ohio / Q000453:epidemiology; D012449:Safety; D014947:Wounds and Injuries / Q000453:epidemiology / Q000517:prevention & control*