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Schaaf

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Comet of the Century: From Halley to Hale-Bopp

By Schaaf, Fred

The Future of Drylands: International Scientific Conference on Desertification and Drylands Research, Tunis, Tunisia, 19-21 June 2006

By Lee, Cathy, Schaaf, Thomas

A History of Invention: From Stone Axes to Silicon Chips

By Williams, Trevor Illtyd, Schaaf, William E., Burnette, Arianne E.