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$61Scientific American Sep 1, 1968
$61Scientific American Oct 1, 1968
$61Scientific American Nov 1, 1968
$61Scientific American Dec 1, 1968
$61Scientific American Jan 1, 1969
$61Scientific American Feb 1, 1969
$61Scientific American Mar 1, 1969
$61Scientific American Apr 1, 1969
$61Scientific American May 1, 1969
$61Scientific American Jun 1, 1969
$61Scientific American Jul 1, 1969
$61Scientific American Sep 1, 1969
$112Pictorial Review Aug 1, 1927
$61Scientific American Oct 1, 1969
$61Scientific American Nov 1, 1969
$61Scientific American Dec 1, 1969
$50Scientific American Jan 1, 1970
$50Scientific American Feb 1, 1970
$50Scientific American Mar 1, 1970
$50Scientific American Apr 1, 1970
$50Scientific American May 1, 1970
$50Scientific American Jun 1, 1970
$50Scientific American Jul 1, 1970
$50Scientific American Aug 1, 1970
$50Scientific American Sep 1, 1970
$50Scientific American Oct 1, 1970
$50Scientific American Nov 1, 1970
$50Scientific American Dec 1, 1970
$50Scientific American Feb 1, 1971
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$50Scientific American Aug 1, 1971
$50Scientific American Oct 1, 1971
$50Scientific American Nov 1, 1971
$50Scientific American Dec 1, 1971
$180Popular Science Sep 1, 1938
$50Scientific American Jan 1, 1972
$50Scientific American Feb 1, 1972
$50Scientific American Mar 1, 1972
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$50Scientific American May 1, 1972
$50Scientific American Jun 1, 1972
$50Scientific American Jul 1, 1972
$50Scientific American Aug 1, 1972
$50Scientific American Sep 1, 1972
$180Popular Science Jan 1, 1938
$50Scientific American Oct 1, 1972
$50Scientific American Dec 1, 1972
$50Scientific American Jan 1, 1973
$50Scientific American Feb 1, 1973
$50Scientific American Apr 1, 1973
$50Scientific American May 1, 1973
$50Scientific American Jun 1, 1973
$50Scientific American Jul 1, 1973
$50Scientific American Aug 1, 1973
$50Scientific American Sep 1, 1973
$50Scientific American Oct 1, 1973
$50Scientific American Nov 1, 1973