15 maio 1951 ano - "The Brass Hats Go Underground" The Cold War - ''Site R'' Breaks Ground - Digging the Pentagon's Fall-Out Shelter The Pathfinder Magazine 1951, May 15

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The Pathfinder Magazine 1951, May 15 - The Brass Hats Go Underground - The Cold War - ''Site R'' Breaks Ground - Digging the Pentagon's Fall-Out Shelter

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