Almost as familiar as the images of the American West he painted and sculpted is the figure of Charles M. Russell himself. Standing or mounted, in boots and wide-brimmed hat, sash knotted at his waist, gaze steady under a hank of unruly hair: he is the one and only Cowboy Artist. What is not so well known is the story that unfolds in the myriad photographs of Russell, pictures that document a remarkable life while also reflecting the evolution...