Sonraí bibleagrafaíochta
| Údar corparáideach: |
National Geographic Society (United States). Cartographic Division |
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| Rannpháirtithe: |
Grosvenor, Gilbert M.,
Garrett, Wilbur, E.,
Garver, John B. Jr,
Darley, Richard J.,
Shupe, John F. |
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| Formáid: | LÉARSCÁIL
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| Foilsithe / Cruthaithe: |
Washington, D.C.
The Society
c1982.
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| Ábhair: | |
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