SPACE SHUTTLE CHALLENGER - STS - 51F CREW - COMMEMORATIVE ENVELOPE SIGNED CO-SIGNED BY: JOHN-DAVID F. BARTOE, ANTHONY ENGLAND, STORY MUSGRAVE, MAJOR GENERAL ROY D. BRIDGES JR., LOREN ACTON, KARL G. HENIZE, COLONEL C. GORDON FULLERTON - HFSID 296096

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