Following is a list of a few old books available on line that pertain to old west and Texas history, and to some interesting individuals from those times and places. I know you'll recognize some of the authors, and on others you'll recognize the subject matter. They aren't Louis L'Amour, but some of the stories are at least as good.
Authentic Life of Billy, the Kid, The Noted Desperado of the Southwest, by Pat F. Garrett
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http://www.blackmask.com/books33c/billythekid.htmCow-Country, by B. M. Bower
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http://ibiblio.org/gutenberg/etext99/cwcnt10.txtExpedition of the Donner Party and its Tragic Fate, by Eliza P. Donner Houghton
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http://lcweb2.loc.gov/cgi-bin/query/r?ammem/calbk:@field(DOCID+@lit(calbk187)):@@@$REF$Flowers and Fruits from the Wilderness, by Z. N. Morrell
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http://www.hti.umich.edu/cgi/t/text/text-idx?c=moa;idno=AAW3495#resultstocGeronimo: His Own Story, by S. M. Barrett
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http://odur.let.rug.nl/~usa/B/geronimo/geronixx.htmJournal of the Texian Expedition Against Mier, by Thomas J. Green
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http://www.smu.edu/swcenter/tjgreen/tjg_home.htmJourney Through Texas: or, A Saddle-Trip on the Southwestern Frontier, by Frederick Law Olmsted
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http://www.hti.umich.edu/cgi/t/text/text-idx?c=moa;idno=AAW3927Last of the Great Scouts: The Life Story of William F. Cody, "Buffalo Bill", by Helen Cody Wetmore
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http://ibiblio.org/gutenberg/etext98/bbill10.txtLife and Adventures of Calamity Jane, by Martha Canary
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http://ibiblio.org/gutenberg/etext96/cjane10.txtLife and Adventures of Nat Love, by Nat Love
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http://docsouth.unc.edu/neh/natlove/natlove.htmlMountain Meadows Massacre, by Josiah Francis Gibbs
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http://www.utlm.org/onlinebooks/meadowscontents.htmMy Life on the Plains: Or, Personal Experiences with Indians, by George A. Custer
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http://www.hti.umich.edu/cgi/t/text/text-idx?c=moa;idno=ACP4940Passing of the Frontier: A Chronicle of the Old West, by Emerson Hough
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http://ibiblio.org/gutenberg/etext02/passf10.txtRanch Life and the Hunting-Trail, by Theodore Roosevelt
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http://www.bartleby.com/54/Remember the Alamo, by Amelia E. Barr
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http://etext.lib.virginia.edu/etcbin/browse-mixed-new?id=BarReme&images=images/modeng&data=/lv1/Archive/eng-parsed&tag=publicVigilantes of Montana, by Thomas Dimsdale
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http://schmittroth.tripod.com/mont_vigi//dimsdale/toc.html