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FROM MERCURY TO APOLLO:

Alan Shepard, who 10 years earlier had become the first American in space, commanded the Apollo 14 mission in 1971. The astronauts returned almost 100 pounds of lunar rocks and soil to Earth, the largest haul of the program to that point. Shepard, pictured here, also hit two golf balls on the lunar surface at the conclusion of the mission's second moon walk.

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