Backup crewmembers Joe Engle (right) and Gene Cernan on a geology field trip at Craters of the Moon, Idaho. 22-23 August 1969. Scan courtesy NASA Johnson.
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Backup crewmembers Joe Engle (right) and Gene Cernan on a geology field trip at Craters of the Moon, Idaho. 22-23 August 1969. Scan courtesy NASA Johnson.