Now it is time for you to read the letters of Mari Sandoz. If it has been a clear summer day and it is near sundown, take this book and a cool drink outside and soak in the wisdom of a writer with a cause. --John R. Wunder, from the foreword Author Mari Sandoz was as passionate about Plains peoples as she was about language and literary acclaim. That the mastery of Crazy Horse's biographer spilled into her zealous advocacy for Native Americans is...