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. Roads, bridges, and pathways wind through the park, and there are restaurants, campgrounds, and hotels. Yet even with the impact of humanity, Yellowstone remains remarkably intact, evidence that the effort to preserve and sustain the park for future generations has been a success.

Combining more than 100 gorgeous “then and now” sets of photographs—the first complete published collection of Jackson’s images from the 1871 Hayden Survey and a result of Boner's three years of work rephotographing them—with history, extensive notes, and personal tales, Yellowstone National Park: Through the Lens of Time pays homage to the park’s early history and its present state, and offers a glimpse into the future. The great experiment of Yellowstone—which captivates millions of visitors from all corners of the globe each year—has transcended generations and should be maintained for generations to come.

The University Press of Colorado and the author gratefully acknowledge the generous contributions of the many donors to the Kickstarter campaign supporting the publication of this book.

The mountains of southwestern Pennsylvania provide the setting for the most popular whitewater in America: the Youghiogheny River at Ohiopyle.  People from all over the nation come to run the rapids, while others simply enjoy the natural beauty of Ohiopyle State Park.  But this Appalachian river has many faces as it flows from its source among the scattered mountain farms of western Maryland to its confluence with the Monongahela in the industrial outskirts of Pittsburgh.  Though always a home to people who cherish their mountain roots, the region’s river offers recreation for millions of Americans.

By canoe, raft, van, and on foot, Tim Palmer explores the river from its highest spring to its industrial end.  He writes about the people - afternoon visitors and eigth-generation natives - and about their pasts and their hopes, about the shaping of the land, and the land’s inevitable shaping of them.

The author chronicles the rise of the five Ohiopyle rafting companies that host 80,000 visitors each year and then takes the reader on one of these outfitted voyages.  Finally, Palmer paddles beyond the Appalachians to the river’s urban end near Pittsburgh.  Strip mining, land development, and recreation management are examined with a consciousness that asks, What will happen to this remarkable but threatened place?