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sandiv999: September 1954 Scientific American Cover
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sandiv999: March 1955 Scientific American Cover
©
sandiv999: January 1956 Scientific American Cover
©
sandiv999: March 1956 Scientific American Cover
©
sandiv999: February 1957 Scientific American Cover
©
sandiv999: March 1962 Scientific American Cover
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sandiv999: October 1963 Scientific American Cover
©
sandiv999: January 1964 Scientific American Cover