the hardships of life on the American frontier , the early 20th century. 美國邊境上的艱辛生活 ， 20世紀初。

early American life on the western prairies of Wyoming, Montana and the Dakotas.

早期的美國懷俄明州，蒙大拿州和北達科他州西部草原生活。

Black and white images give a rare glimpse of life on the American frontier | Mail Online http://www.dailymail.co.uk/news/article-2140121/Black-white-images-rare-glimpse-life-American-frontier.html