Treading the elephant's tail: medical problems on the overland trails.
D002140:California; D002771:Cholera / Q000266:history; D003121:Colorado Tick Fever / Q000266:history; D003967:Diarrhea / Q000266:history; D049672:History, 19th Century; D006801:Humans; D009922:Oregon; D014481:United States; D014947:Wounds and Injuries / Q000266:history