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$44National Geographic Oct 1, 1960
$44National Geographic Nov 1, 1960
$44National Geographic Dec 1, 1960
$44National Geographic Apr 1, 1961
$44National Geographic Oct 1, 1961
$44National Geographic Nov 1, 1963
$44National Geographic Jan 1, 1964
$44National Geographic Jul 1, 1964
$44National Geographic Sep 1, 1964
$44National Geographic Oct 1, 1964
$44National Geographic Feb 1, 1966
$44National Geographic Mar 1, 1966
$44National Geographic Feb 1, 1967
$44National Geographic May 1, 1967
$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
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$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
$44National Geographic May 1, 1985
$44National Geographic Sep 1, 1985
$44National Geographic Jun 1, 1986
$44National Geographic May 1, 1987
$44National Geographic Jun 1, 1987
$44National Geographic Jul 1, 1987
$44National Geographic Sep 1, 1988
$44National Geographic Oct 1, 1988
$44National Geographic May 1, 1989
$44National Geographic Nov 1, 1989
$44National Geographic Dec 1, 1989
$44National Geographic Jan 1, 1990
$44National Geographic Oct 1, 1990
$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
$44National Geographic Oct 1, 1992
$44National Geographic Feb 1, 1993
$44National Geographic Mar 1, 1993
$44National Geographic Jul 1, 1993