Title: William Dietrich's Ethan Gage Collection #1: Books 1-3: Napoleon's Pyramids, The Rosetta Key, and The Dakota Cipher, Author: William Dietrich
Title: The Dakota Cipher (Ethan Gage Series #3), Author: William Dietrich
Title: M is for Mount Rushmore: A South Dakota Alphabet, Author: William Anderson
Title: Report of a Reconnaissance of the Black Hills of Dakota, Made in the Summer of 1874. by William Ludlow, Captain of Engineers, Bvt. Lieut. Colonel, U.S, Author: United States Army Corps of Engineers
Title: Report of a reconnaissance of the Black hills of Dakota, made in the summer of 1874. By William Ludlow, captain of engineers, Bvt. Lieut. Colonel, U.S. Army., Author: United States Army Corps of Engineers