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U.S. Postal Commemorative, Jefferson National Expansion Memorial
St. Louis, Missouri
More than 365 miles of passages have been explored and mapped in Mammoth Cave, in Kentucky. This is the longest known cave in the world; according to tradition, it was discovered in the 1790’s by a hunter chasing a bear.
Wonders of America: Land of Superlatives Stamp Series@2005 United States Postal Service. All rights reserved. Used with Permission.
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Image courtesy of Jim Roberts, GVCC