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$71Popular Mechanics Sep 1, 1986
$71Popular Mechanics Oct 1, 1986
$71Popular Mechanics Nov 1, 1986
$71Popular Mechanics Dec 1, 1986
$71Popular Mechanics Jan 1, 1985
$71Popular Mechanics Feb 1, 1985
$71Popular Mechanics Aug 1, 1985
$71Popular Mechanics Oct 1, 1985
$71Popular Mechanics Dec 1, 1985
$44National Geographic Jan 1, 1950
$44National Geographic Apr 1, 1950
$44National Geographic Aug 1, 1950
$44National Geographic Nov 1, 1950
$44National Geographic Jan 1, 1953
$44National Geographic Jun 1, 1953
$44National Geographic Jul 1, 1953
$44National Geographic Jan 1, 1960
$44National Geographic Mar 1, 1960
$44National Geographic Feb 1, 1961
$44National Geographic Jul 1, 1961
$44National Geographic Aug 1, 1961
$44National Geographic Aug 1, 1962
$44National Geographic Nov 1, 1962
$44National Geographic Dec 1, 1962
$44National Geographic Mar 1, 1964
$44National Geographic Apr 1, 1964
$44National Geographic Aug 1, 1964
$44National Geographic Nov 1, 1965
$44National Geographic May 1, 1966
$44National Geographic Oct 1, 1966
$44National Geographic Jan 1, 1969
$44National Geographic Feb 1, 1969
$44National Geographic Apr 1, 1969
$44National Geographic Sep 1, 1989
$44National Geographic Jan 1, 1991
$44National Geographic Nov 1, 1996
$44National Geographic Nov 1, 1997
$44National Geographic Dec 1, 1996
$44National Geographic Mar 1, 1996
$44National Geographic Jan 1, 1999
$44National Geographic Feb 1, 1999
$44National Geographic May 1, 1940
$44National Geographic Mar 1, 1944
$44National Geographic May 1, 1951
$44National Geographic May 1, 1977
$44National Geographic Nov 1, 1973
$44National Geographic Apr 1, 1976
$44National Geographic Nov 1, 1972
$44National Geographic Feb 1, 1973
$44National Geographic Jan 1, 1971
$44National Geographic Jul 1, 2000
$44National Geographic Nov 1, 2004
$44National Geographic Aug 1, 2009
$44National Geographic Sep 1, 2008
$44National Geographic Jul 1, 1965
$44National Geographic Mar 1, 1968
$44National Geographic Feb 1, 1996
$44National Geographic Nov 1, 1999
$44National Geographic Feb 1, 1984
$44National Geographic Apr 1, 1986