   
In 1876 a variation on the same image was published by Louis Prang in a portfolio of chromolithographs (color reproductions made from specially prepared stones). This remarkable printing effort
helped spread news of Yellowstone and Moran to a wide audience. Prang's portfolio was heralded as one of the most spectacular publications of the age. Thomas Moran, The Great Blue Spring of the Lower Geyser Basin, from the portfolio The Yellowstone National Park, and the Mountain Regions of Portions of Idaho, Nevada, Colorado, and Utah," published by Louis Prang of Boston, 1876, courtesy Gilcrease Museum, Tulsa, Oklahoma  
|