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$187Popular Science May 1, 1928
$187Popular Science Jul 1, 1928
$187Popular Science Aug 1, 1928
$163Popular Science Dec 1, 1928
$187Popular Science Jan 1, 1929
$187Popular Science Jun 1, 1930
$187Popular Science Sep 1, 1930
$187Popular Science Apr 1, 1931
$187Popular Science Sep 1, 1931
$187Popular Science Jan 1, 1932
$187Popular Science Apr 1, 1932
$187Popular Science Apr 1, 1933
$187Popular Science Jun 1, 1933
$163Popular Science Nov 1, 1933
$187Popular Science Mar 1, 1934
$163Popular Science Feb 1, 1935
$163Popular Science Mar 1, 1935
$163Popular Science May 1, 1935
$187Popular Science Jun 1, 1935
$163Popular Science Jul 1, 1935
$163Popular Science Nov 1, 1935
$187Popular Science Jan 1, 1936
$187Popular Science Mar 1, 1936
$163Popular Science May 1, 1936
$187Popular Science Nov 1, 1936
$187Popular Science Dec 1, 1936
$152Popular Science Jan 1, 1937
$163Popular Science Mar 1, 1937
$163Popular Science Apr 1, 1937
$187Popular Science May 1, 1937
$163Popular Science Jun 1, 1937
$163Popular Science Sep 1, 1937
$163Popular Science Oct 1, 1937
$163Popular Science Feb 1, 1938
$163Popular Science May 1, 1938
$152Popular Science Jun 1, 1938
$163Popular Science Nov 1, 1938
$163Popular Science Jan 1, 1939
$152Popular Science May 1, 1939
$152Popular Science Jun 1, 1939
$163Popular Science Oct 1, 1939
$163Popular Science Nov 1, 1939
$163Popular Science Dec 1, 1939
$141Popular Science Jan 1, 1940
$141Popular Science Feb 1, 1941
$141Popular Science Jan 1, 1942
$141Popular Science Mar 1, 1942
$141Popular Science Apr 1, 1942
$141Popular Science May 1, 1942
$141Popular Science Jul 1, 1942
$141Popular Science Nov 1, 1942
$141Popular Science Dec 1, 1942
$128Popular Science Feb 1, 1943
$141Popular Science Sep 1, 1943
$141Popular Science Nov 1, 1943
$141Popular Science Feb 1, 1944
$105Popular Science Dec 1, 1944
$55Scientific American Apr 1, 1962
$55Scientific American May 1, 1962
$55Scientific American Jun 1, 1962