Dr. Moira Gunn speaks with John Warfield Simpson, Professor of Landscape Architecture and Natural Resources, Ohio State University, and the author of "Dam! -- Water, Power, Politics, and Preservation in Hetch Hetchy and Yosemite National Park." He relates the technical -- and political -- tale which enabled the tiny city of San Francisco to dam an entire mountain valley some 200 miles away, a sister valley to the famous Yosemite -- all in the name of progress.

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Post-production audio for Team ITC by Paul Figgiani.