California as I Saw It: First-Person Narratives of California's Early Years, 1849-1900
http://lcweb2.loc.gov/ammem/cbhtml/cbhome.html
Close to 200 first-person narratives by politicians, soldiers, pioneers, and travelers. The texts can be browsed by topic or searched.

Native American Documents Project
http://ww2.csusm.edu/nadp/nadp.htm
A small collection of documents on Indian policy in the late nineteenth century.

New Perspectives on the West
http://www3.pbs.org/weta/thewest/
The companion site to the PBS documentary. Includes a timeline.

Stereoviews of Indians and the Colorado River from the J. A. Powell Survey, ca. 1869-1874
http://www.oac.cdlib.org:28008/dynaweb/ead/calher/colorado/@Generic__BookView?DwebQuery=j.a.+powell&DwebSearchAll=1
Portraits and camp scenes.

The Frontier In American History
http://avery.med.virginia.edu/~mwk2c/turner/turner.html
Frederick Jackson Turner's 1921 interpretation of the American West.

Virgin Land: The American West As Symbol and Myth, by Henry Nash Smith
http://xroads.virginia.edu/~HYPER/HNS/home.htm

Westward the Course of Empire
http://www.mcny.org/westward.htm
Currier & Ives images of the West in the 1860s and 70s.

WestWeb: Western History Resource
http://www.library.csi.cuny.edu/westweb/
Documents and links.