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Larry Ulrich is one of the country's most published photographers. His images have appeared in Audubon, Sierra, Wilderness, National Geographic, Arizona Highways, and Newsweek, among others. Susan Lamb began her career as a naturalist with the National Park Service at Golden Gate National Recreation Area in San Francisco, eventually transferring to Grand Canyon National Park.She writes books and articles on natural and human history, among them Ancient Walls: Indian Ruins of the Southwest, Lava Beds National Monument, Alcatraz: The Rock, Grand Canyon: The Place of Emergence, and many others.