Why America has dug the Panama Canal. 1912.
D000328:Adult; D002648:Child; D005260:Female; D005602:France / Q000208:ethnology; D049673:History, 20th Century; D006801:Humans; D008297:Male; D010176:Panama / Q000453:epidemiology; D014481:United States / Q000208:ethnology; D015004:Yellow Fever / Q000266:history* / Q000401:mortality