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$55Scientific American Sep 1, 1968
$55Scientific American Oct 1, 1968
$55Scientific American Nov 1, 1968
$55Scientific American Dec 1, 1968
$55Scientific American Jan 1, 1969
$55Scientific American Feb 1, 1969
$55Scientific American Mar 1, 1969
$55Scientific American Apr 1, 1969
$55Scientific American May 1, 1969
$55Scientific American Jun 1, 1969
$55Scientific American Jul 1, 1969
$55Scientific American Sep 1, 1969
$55Scientific American Oct 1, 1969
$55Scientific American Nov 1, 1969
$55Scientific American Dec 1, 1969
$46Scientific American Jan 1, 1970
$46Scientific American Feb 1, 1970
$46Scientific American Mar 1, 1970
$46Scientific American Apr 1, 1970
$46Scientific American May 1, 1970
$46Scientific American Jun 1, 1970
$46Scientific American Jul 1, 1970
$46Scientific American Aug 1, 1970
$46Scientific American Sep 1, 1970
$46Scientific American Nov 1, 1970
$46Scientific American Dec 1, 1970
$46Scientific American Feb 1, 1971
$46Scientific American Apr 1, 1971
$46Scientific American May 1, 1971
$46Scientific American Jun 1, 1971
$46Scientific American Jul 1, 1971
$46Scientific American Aug 1, 1971
$46Scientific American Oct 1, 1971
$46Scientific American Nov 1, 1971
$46Scientific American Dec 1, 1971
$163Popular Science Sep 1, 1938
$46Scientific American Jan 1, 1972
$46Scientific American Feb 1, 1972
$46Scientific American Mar 1, 1972
$46Scientific American Apr 1, 1972
$46Scientific American May 1, 1972
$46Scientific American Jun 1, 1972
$46Scientific American Jul 1, 1972
$46Scientific American Aug 1, 1972
$46Scientific American Sep 1, 1972
$163Popular Science Jan 1, 1938
$46Scientific American Oct 1, 1972
$46Scientific American Dec 1, 1972
$46Scientific American Aug 1, 1973
$46Scientific American Sep 1, 1973
$46Scientific American Oct 1, 1973
$46Scientific American Nov 1, 1973
$46Scientific American Dec 1, 1973
$163Popular Science Jan 1, 1933
$46Scientific American Jan 1, 1974
$46Scientific American Mar 1, 1974
$46Scientific American Feb 1, 1974
$46Scientific American Apr 1, 1974
$46Scientific American Jun 1, 1974
$46Scientific American Jul 1, 1974