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"All color photography on this website was taken by Phil Stoffer (USGS) unless otherwise stated on the image caption text. All images are in the public domain and may be freely used or reproduced."--website
"Millions of visitors have seen Yellowstone's bubbling mud pots and clockwork geysers, but 90 percent of the national park's 2 million acres are barely touched, holding far more than what most people see. It's a giant swath of terrain-much of it remote, some of it dangerous-but all of it commands awe and respect. Wolves, bison, and bears roam freely; an incredible number of waterfalls have been documented in recent years; and many more life-changing encounters with the natural world await the intrepid explorer. This program takes biology and earth science students beyond the tourist spots to see a hidden, astonishingly rich Yellowstone." -- catalog description
"Three of the most catastrophic volcanic eruptions in geologic history occurred at a place now visited by nearly four million people per year: Yellowstone National Park. The magma chamber responsible still lies beneath, and continues to steam, heat, and shift the park landscape. This science bulletin talks with the geologists regularly monitoring these disquieting signals to understand where this active region lies in its volcanic life span." -- catalog description
"A progenitor of the National Geographic Society, John Wesley Powell was a naturalist, a rough-and-ready explorer, and a visionary in his understanding of the uncharted Colorado River. This program illustrates Powell's historic passage through the Grand Canyon in 1869, when the 35-year-old set out with eight companions from Green River, Wyoming, into the unknown. The film describes how, at various stopping points, four members of the crew abandoned the mission-one vanishing from recorded history and three dying in the desert instead of the rapids they thought would kill them-while Powell and his remaining cohorts went on to achieve scientific and popular glory." -- catalog description