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$44National Geographic Sep 1, 1967
$44National Geographic Jan 1, 1968
$44National Geographic Apr 1, 1968
$44National Geographic Dec 1, 1968
$44National Geographic Jul 1, 1969
$44National Geographic Sep 1, 1969
$44National Geographic Dec 1, 1969
$44National Geographic Jan 1, 1970
$44National Geographic Mar 1, 1970
$44National Geographic Dec 1, 1970
$44National Geographic May 1, 1971
$44National Geographic Sep 1, 1972
$44National Geographic Mar 1, 1974
$44National Geographic Jan 1, 1976
$44National Geographic Feb 1, 1976
$44National Geographic Oct 1, 1977
$44National Geographic Jan 1, 1978
$44National Geographic Jul 1, 1978
$44National Geographic Sep 1, 1980
$44National Geographic Sep 1, 1981
$44National Geographic Jan 1, 1982
$44National Geographic Oct 1, 1983
$44National Geographic Apr 1, 1984
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$44National Geographic Sep 1, 1985
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$44National Geographic May 1, 1987
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$44National Geographic Dec 1, 1989
$44National Geographic Jan 1, 1990
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$44National Geographic Nov 1, 1990
$44National Geographic Feb 1, 1991
$44National Geographic Jun 1, 1991
$44National Geographic May 1, 1992
$44National Geographic Jun 1, 1992
$44National Geographic Jul 1, 1992
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$44National Geographic Aug 1, 1995
$44National Geographic Apr 1, 1997
$44National Geographic Jun 1, 1997
$44National Geographic Jan 1, 1998
$44National Geographic Feb 1, 1998
$44National Geographic Aug 1, 1998