by Omer B. Raup ... [and others] ; photography by Omer B. Raup ; pen and ink drawings by Arthur L. Isom and Omer B. Raup ; prepared by the U.S. Geological Survey in cooperation with the National Park Service
[presented by] U.S. Geological Survey in collaboration with the National Park Service ; producer-director, Anne Tubiolo ; writers, Sandra Clark, Anne Tubiolo, Elizabeth Romanaux