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Charles Gehrke, researcher and businessman, dies at 91

February 11, 2009 | 10:58 p.m. CST
Charles Gehrke, left, and graduate student Robert Zumwalt examine a sample of lunar rock at Jet Propulsion Laboratories in Pasadena, Calif. in the late '60s or early 70s. The moon rocks were brought home by one of the Apollo missions.

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