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Pioneer photographer William Henry Jackson's photographs from the 1871 Hayden Survey were instrumental in persuading Congress to designate Yellowstone as a national park - America's first and greatest experiment in the preservation of an extraordinary landscape. Yellowstone National Park: Through the Lens of Time is an extended visual essay presenting Jackson's images paired with breathtaking color rephotographs of each view from photojournalist Bradly J. Boner. These contemporary comparisons to Jackson's originals reveal just how well that experiment has stood the test of time.Yellowstone is always changing. The Grand Canyon is getting deeper and wider as the Yellowstone River carves a chasm into the earth. The flows of the great hot springs at Mammoth are creating new layers of delicate, colorful cascades and leaving the old terraces to crumble in decay.