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He has authored more than 50 scientific publications and seven texts, including "BIOLOGY" (with botanist Peter Raven), "THE LIVING WORLD" and a widely used high school biology textbook, "HOLT BIOLOGY." As the founding director of The Living World, the education center at the St Louis Zoo, from 1987 to 1990, he was responsible for developing innovative high-tech exhibits and new educational programs

Complutense University of Madrid

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The only study The Examination could find was done by Denmarks Environmental Protection Agency

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On network television, the industry spent forty-five million three hundred thousand dollars for the quarter, as opposed to forty-three and a half million dollars for the first quarter of 1968, and its expenditures for spot announcements on individual stations rose by more than a million dollars, to a total of eleven million two hundred thousand dollars