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Distances Traveled by Our Four Oldest RTG-Powered Spacecraft, DOE Memo to Al Newhouse, Bob Lange, Ed Mastal, Art Mehner, Bev Cook &Amp; V. Cassella of DOE. Attached Is a Copy of Letter From Hazel R. O'Leary, Secretary of Energy to Admiral Bruce Demars, Secretary of the Navy Dated 5/4/1994, Subject: 100 Million Mile Milestone on Nuclear Power. Attached Is a Copy of Letter From President Bill Clinton to Hazel Rollins O'Leary, Secretary of Energy Dated 4/25/1994