The American West, 150 Years Ago.美國西部，150年前。

 Utah, in 1872. (Timothy O'Sullivan/NARA) #

1871 (Timothy O'Sullivan/LOC) #

1875. (Timothy O'Sullivan/LOC) #

 1873. (Timothy O'Sullivan/LOC) #

(Timothy O'Sullivan/LOC) #

(Timothy O'Sullivan/LOC) #

 (Timothy O'Sullivan/LOC) #
In Focus - The American West, 150 Years Ago - The Atlantic http://www.theatlantic.com/infocus/2012/05/the-american-west-150-years-ago/100304/