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$58Scientific American Nov 1, 1968
$58Scientific American Dec 1, 1968
$58Scientific American Jan 1, 1969
$58Scientific American Feb 1, 1969
$58Scientific American Mar 1, 1969
$58Scientific American Apr 1, 1969
$58Scientific American May 1, 1969
$58Scientific American Jun 1, 1969
$58Scientific American Jul 1, 1969
$58Scientific American Sep 1, 1969
$107Pictorial Review Aug 1, 1927
$58Scientific American Oct 1, 1969
$58Scientific American Nov 1, 1969
$58Scientific American Dec 1, 1969
$48Scientific American Jan 1, 1970
$48Scientific American Feb 1, 1970
$48Scientific American Mar 1, 1970
$48Scientific American Apr 1, 1970
$48Scientific American May 1, 1970
$48Scientific American Jun 1, 1970
$48Scientific American Jul 1, 1970
$48Scientific American Aug 1, 1970
$48Scientific American Sep 1, 1970
$48Scientific American Oct 1, 1970
$48Scientific American Nov 1, 1970
$48Scientific American Dec 1, 1970
$48Scientific American Feb 1, 1971
$48Scientific American Apr 1, 1971
$48Scientific American May 1, 1971
$48Scientific American Jun 1, 1971
$48Scientific American Jul 1, 1971
$48Scientific American Aug 1, 1971
$48Scientific American Oct 1, 1971
$48Scientific American Nov 1, 1971
$48Scientific American Dec 1, 1971
$171Popular Science Sep 1, 1938
$48Scientific American Jan 1, 1972
$48Scientific American Feb 1, 1972
$48Scientific American Mar 1, 1972
$48Scientific American Apr 1, 1972
$48Scientific American May 1, 1972
$48Scientific American Jun 1, 1972
$48Scientific American Jul 1, 1972
$48Scientific American Aug 1, 1972
$48Scientific American Sep 1, 1972
$171Popular Science Jan 1, 1938
$48Scientific American Oct 1, 1972
$48Scientific American Dec 1, 1972
$48Scientific American Jan 1, 1973
$48Scientific American Feb 1, 1973
$48Scientific American Apr 1, 1973
$48Scientific American May 1, 1973
$48Scientific American Jun 1, 1973
$48Scientific American Jul 1, 1973
$48Scientific American Aug 1, 1973
$48Scientific American Sep 1, 1973
$48Scientific American Oct 1, 1973
$48Scientific American Nov 1, 1973
$48Scientific American Dec 1, 1973
$171Popular Science Jan 1, 1933