Nat Geo Jan 1973
National Geographic January 1973
FeaturesTies Changing EarthCalifornia San Aicatas Fairt
Nat Geo Feb 1973
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National Geographic May 1973
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National Geographic June 1973
FeaturesAustralias Great Barrier RiefLaz Cycle Of A Cotal
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FeaturesHomeward With UlissesVolcano Webayelers
Nat Geo Aug 1973
National Geographic August 1973
FeaturesThe Biggest EaglesThe Spe The Waters
Nat Geo Sep 1973
National Geographic September 1973
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Nat Geo Oct 1973
National Geographic October 1973
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Nat Geo Nov 1973
National Geographic November 1973
FeaturesFlorida HeartlandThe Friendless
Nat Geo Dec 1973
National Geographic December 1973
FeaturesLost Empire Of The IncasAspen Fongers The Future
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