James Willard Schultz 
Bird Woman (Sacajawea) the Guide of Lewis and Clark: Her Own Story Now First Given to the World [EPUB ebook] 

Bird Woman is historian James Schultz’s biography of Sacajawea culled from the first-hand accounts of various elderly Native Americans who personally knew her. Schultz weaves together the key events in Sacajawea’s story, from her traumatic childhood and adolescence, being captured and taken away from her home by a raiding party of Minnetaree, to her unhappy marriage to the interpreter Toussaint Charbonneau, through to her life assisting in Lewis and Clark’s exploration of the Pacific Northwest.
“A dazzling glimpse into a vanished past.” — 
The New York Times.