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2 documents have been found dated from 1969, archived in Rockefeller Archive Center and created by Halley Jr., Donald M..

EN Carta de Donald M. Jr. Halley a Nelson Rockefeller

Yonkers, 20 March 1969 - Institutional correspondence

Donald M. Jr. Halley's letter to Nelson Rockefeller

EN Carta de Donald M. Jr. Halley a Nelson Rockefeller

18 July 1969 - Institutional correspondence

Donald M. Halley Jr.'s letter to Nelson Rockefeller