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National Geographic Magazine, June 2003 | 0 |
| National Geographic |
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National Geographic: Change of Heartland-America's Great Plains (May 2004, Volume 205, Number 5) | 0 |
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National Geographic Magazine, July 2001 (Vol. 200, No. 1) | 0 |
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National Geographic, May 2008 Issue | 0 |
| National Geographic |
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National Geographic April 2007: Saving the Sea's Bounty | 1 |
| National Geographic Society |
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National Geographic Magazine Vol. 198, No. 1 July 2000 | 0 |
| National Geographic |
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National Geographic Vol. 201 No. 1, January 2002 (National Geographic) | 0 |
| National Geographic Society |
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National Geographic: April 2002 | 0 |
| Editors of NATIONAL GEOGRAPHIC Magazine |
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National Geographic, March 2008 Issue | 0 |
| National Geographic |
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National Geographic January 2007: Amazon Forest to Farms, Battle to Stop the Land Grab | 0 |
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National Geographic, December 2008 Issue | 0 |
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National Geographic, November 2008 Issue | 0 |
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Islam's Fault Line: Pakistan (National Geographic Magazine, Vol. 212, No. 3, September 2007) | 0 |
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National Geographic Magazine Vol. 197, No. 6 June 2000 | 0 |
| National Geographic |
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National Geographic: April 2004 | 0 |
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National Geographic World Magazine / June 1986 | 0 |
| National Geographic |
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Growing Fuel: The Wrong Way, The Right Way (National Geographic Magazine, Vol 212, No. 4, October 2007) | 0 |
| Editors of NATIONAL GEOGRAPHIC Magazine |
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National Geographic, April 2008 Issue | 0 |
| National Geographic |
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National Geographic: The Heavy Cost of Fat (August 2004, Volume 206, Number 2) | 0 |
| National Geographic |
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National Geographic: Great Whites of the North (February 2004, Volume 205, Number 2) | 0 |
| National Geographic |
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National Geographic: Red Hot Hawaii (October 2004, Volume 205, Number 4) | 0 |
| National Geographic Society |
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National Geographic Magazine December 1999, Volume 196 No. 6 | 0 |
| National Geographic |
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National Geographic Magazine (July 1996) (Vol. 190, No.1) | 0 |
| National Geographic Magazine |
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National Geographic Magazine January 2004 | 0 |
| National Geographic Magazine |
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National Geographic Magazine December 2003 | 1 |
| National Geographic Society (U.S.) |
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Exploring America's Backcountry (Special Publications Series 14) | 0 |
| National Geographic Magazine |
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National Geographic Magazine February 2003 | 2 |
| National Geographic |
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National Geographic Vol. 202. No. 5, November 2002 (National Geographic) | 0 |
| National Geographic |
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National Geographic Vol. 202. No. 2, August 2002 (National Geographic) | 0 |
| National Geographic |
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National Geographic Vol. 202 No. 6, December 2002 (National Geographic) | 0 |
| National Geographic |
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National Geographic Vol. 201 No. 3, March 2002 (National Geographic) | 0 |
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National Geographic Vol. 201 No. 2, February 2002 (National Geographic) | 0 |
| National Geographic |
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National Geographic Vol. 201 No. 5, May 2002 (National Geographic) | 0 |
| NATIONAL GEOGRAPHIC SOCIETY |
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National Geographic Society Nature's World of Wonders | 0 |
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National Geographic Magazine, February 2001 | 0 |
| National Geographic |
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National Geographic: Emperors of the Ice (March 1996, Volume 189, Number 3) | 0 |
| National Geographic |
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National Geographic: Rana Tharu-Nepal's Women of Grace (September 2000, Volume 198, Number 3) | 0 |
| National Geographic |
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National Geographic: Sun Bursts-Hot News From Our Stormy Star (July 2004, Volume 206, Number 1) | 0 |
| National Geographic Society |
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National Geographic Society Magazine August 1999 | 0 |
| National Geographic |
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National Geographic Magazine ~ July, 2007 {Malaria, Iceman Mystery, Birds of Paradise, Tongass National Forest, Swarms} | 0 |
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The Marvels of Animal Behavior | 0 |
| National Geographic Society |
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National Geographic Magazine Exploiting the Ocean's Bounty Diminishing Returns (November 1995) (Vol. 188, No.5) | 0 |
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National Geographic Magazine (January 1997) (Vol. 191, No.1) | 0 |
| National Geographic Society |
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National Geographic Magazine (June 1996) (Vol. 189, No.6) | 0 |
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National Geographic Magazine (October 1996) (Vol. 190, No.4) | 0 |
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National Geographic Magazine: Into the Heart of Glaciers (February 1996) (Vol. 189, No.2) | 0 |
| National Geographic Society |
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National Geographic Magazine: Hawaii's Vanishing Species (September 1995) (Vol. 188, No.3) | 0 |
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National Geographic: May 1984 | 0 |
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National Geographic: June 1999 | 0 |
| National Geographic Society |
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National Geographic Magazine (April 2000, Vol. 197, No. 4) | 0 |
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