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| Preview | Issue Date | Title | Author(s) |
|---|---|---|---|
 | Oct-1991 | The National Geographic Magazine : Volume 180 : N4 | Grosvenor, Gilbert H.; Graves, William |
 | Mar-1990 | The National Geographic Magazine : Volume 177 : N3 | Grosvenor, Gilbert H.; Garrett, Wilbur E.; Judge, Joseph; Smith, Thomas R.; McCarry, Charles |
 | Jan-1990 | The National Geographic Magazine : Volume 177 : N1 | Grosvenor, Gilbert H.; Garrett, Wilbur E.; Judge, Joseph; Smith, Thomas R.; McCarry, Charles |
 | Sep-1990 | The National Geographic Magazine : Volume 178 : N3 | Grosvenor, Gilbert H.; Graves, William |
 | Nov-1990 | The National Geographic Magazine : Volume 178 : N5 | Grosvenor, Gilbert H.; Graves, William |
 | Dec-1990 | The National Geographic Magazine : Volume 178 : N6 | Grosvenor, Gilbert H.; Graves, William |
 | Aug-1990 | The National Geographic Magazine : Volume 178 : N2 | Grosvenor, Gilbert H.; Graves, William |
 | Oct-1990 | The National Geographic Magazine : Volume 178 : N4 | Grosvenor, Gilbert H.; Graves, William |
 | Feb-1991 | The National Geographic Magazine : Volume 179 : N2 | Grosvenor, Gilbert H.; Graves, William |
 | Jul-1990 | The National Geographic Magazine : Volume 178 : N1 | Grosvenor, Gilbert H.; Graves, William |