Mark L. Gardner

• Bent's Old Fort National Historic Site
• Fort Bowie National Historic Site
• Fort Union National Monument
• George Armstrong Custer
• Geronimo
• In the Shadow of Pike's Peak
• Little Bighorn Battlefield National Monument
• Santa Fe Trail
• Southwestern Journals of Zebulon Pike, 1806-1807
• The Mexican Road
• To hell on a fast horse
• Wagons for the Santa Fe Trade