The American west :a new interpretative history

 Hine, Robert V.; Faragher, John Mack;

New Haven : Yale University Press , 2000

American chronicle :year by year through the twentieth centurty

 Gordon, Lois; Gordon, Alan;

New Haven : Yale University Press , 1999

the new encyclopedia of the american west

 Lamar, Howard R.;

New Haven : Yale University Press , s.a.

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