Refusal to permit down-grading of Ranger, Mariner, and Surveyor launch dates to unclassified : letter to William H. Pickering, JPL Director, 1963 Apr 30.
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Cortright, Edgar M.
http://n2t.net/ark:/99166/w6bd1jj7 (person)
Cortright was Deputy Associate Administrator for Space Science and Applications. From the description of Ranger 6 Failure : letter to William H. Pickering, Robert J. Parks, and Harris M. Schurmeier, 1964 Feb 5. (Jet Propulsion Laboratory Library and Archives). WorldCat record id: 733095323 From the description of Expressing support for the Ranger program after the failure of Ranger 6 : letter to William H. Pickering, Robert J. Parks, and Harris M. Schurmeier, 1964 Feb 5. (Je...