This postcard book is one of the series produced to share the splendor and beauty of America’s National Parks, Monuments, and other natural areas. This title includes 14 individual postcards featuring the imagery of America’s leading wildlife photographers and expanded interpretative captions.
The fact that when conditions are right Grand Prismatic Spring, the largest in Yellowstone, displays the most stunning palette of saturated color imaginable. The streaks and swirls of color are attributed to various types of algae growing in the shallow runoff apron.
—From “Yellowstone: Postcard Book”
Yellowstone: Postcard Book
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