* Across the Wide and Lonesome Prairie: The Oregon Trail Remembered (1992)
* The OregonTrail (1993)
* California's Gold: The Letters and Journals of Richard Barnes Hasson, 1849-1855 (1995)
* Deadwood: The Golden Years (1996)
* The Wild Bunch (1998)
* Butch Cassidy and the Sundance Kid (2000)
* The Lone Ranger (2002)
* The Life and Legend of Wyatt Earp (2004)
* Doc Holliday: The Life and Legend of John Henry Holliday (2007)
* Jesse James: The Man and the Myth (2009)
* Billy the Kid: The True Life of Billy the Kid (2011)
* Geronimo: The Man, His Time, His Place (2013)
* Crazy Horse: The Life of Oglala Lakota Warrior (2015)
* Custer's Last Stand: The True Story of the Battle of the Little Bighorn (2017)
* The Apache Wars: The True Story of the Apache-American Wars (2019)
Articles and essays:
* "The Oregon Trail: A History" (Montana: The Magazine of Western History, 1992)
* "California's Gold: The Letters and Journals of Richard Barnes Hasson, 1849-1855" (California History, 1995)
* "Deadwood: The Golden Years" (South Dakota History, 1996)
* "The Wild Bunch: A History" (Wild West, 1998)
* "Butch Cassidy and the Sundance Kid: The True Story" (True West, 2000)
* "The Lone Ranger: A History" (The Western Historical Quarterly, 2002)
* "The Life and Legend of Wyatt Earp" (The Journal of Arizona History, 2004)
* "Doc Holliday: The Life and Legend of John Henry Holliday" (The Journal of the West, 2007)
* "Jesse James: The Man and the Myth" (Missouri Historical Review, 2009)
* "Billy the Kid: The True Life of Billy the Kid" (New Mexico Historical Review, 2011)
* "Geronimo: The Man, His Time, His Place" (Arizona and the West, 2013)
* "Crazy Horse: The Life of Oglala Lakota Warrior" (Nebraska History, 2015)
* "Custer's Last Stand: The True Story of the Battle of the Little Bighorn" (Montana: The Magazine of Western History, 2017)
* "The Apache Wars: The True Story of the Apache-American Wars" (New Mexico Historical Review, 2019)