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$105Popular Science Aug 1, 1949
$40Scientific American Jan 1, 1990
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$40Scientific American The Laureates' Anthology Vol. II Jan 1, 1991
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$40Scientific American How the Leopard Gets Its Spots Jan 1, 1992
$40Scientific American How Dinosaurs Ran Jan 1, 1992
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$40Scientific American New Challenges for 1993 Dec 1, 1992
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$40Scientific American Life, Death and the Immune System Sep 1, 1993
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$40Scientific American New Challenges for 1994 Dec 1, 1993
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