Watercolor images of Yellowstone Park painted in the early 1870s by artist Thomas Moran shifted America's gaze westward. Published as a portfolio of chromolithographs by Boston lithographer Louis Prang, these brilliant reproductions--with a companion text on Yellowstone geology by explorer Ferdinand Hayden--were the first color images of our first national park widely available to the general public. As such, they helped shape America's growing fascination...