This set of 10 First Day Issue Covers commemorates the Lewis & Clark expedition of 1804-1806. Each cover depicts a different aspect of the expedition, including maps, portraits, and historic landmarks. The covers are cancelled with a unique fancy cancellation featuring the denomination of 37 cents. These covers have been previously used and may show signs of wear, but they are in overall good condition and would make a great addition to any stamp collection. The covers are uncertified and were issued in the United States between 2001-2010. Celebrate this important moment in American history with these beautiful and unique covers.