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300th Anniversary of the Explorations of Jacques Marquelle 1668-1968 Block of Stamps First Day Cover

Honoring Daniel Boone 1735-1820, American Folklore Series First Day Cover

Arkansas River Navigation Project 1968 First Day Cover

Honoring Leif Erikson First Day Cover

Honoring Leif Erikson, Eleventh Century Norse Explorer - Discoverer of North America about 1003 Block of Stamps First Day Cover

75th Anniversary of The Opening of the Cherokee Strip 1893-1968 First Day Cover

75th Anniversary of the Opening of the Cherokee Strip 1893-1968 Block of Stamps First Day Cover

Honoring John Trumbull, 1756-1843, Famous American Artist First Day Cover

John Dewey 1859-1952 30¢ Prominent Americans Series First Day Cover

Waterfowl Conservation 1968 First Day Cover

Season&#039;s Greetings Christmas 1968 First Day Cover

Season&#039;s Greetings, Christmas 1968 Block of Stamps First Day Cover

Salute to the American Indian First Day Cover

20c Air Mail Stamp Series of 1968 First Day Cover

20c Air Mail Stamp Series of 1968 Block of Stamps First Day Cover

Beautification of America - Restore America to its National Heritage of Beauty First Day Cover

Beautification of America First Day Cover

Beautification of America First Day Cover

Beautification of America - Restore America to its national heritage of beauty First Day Cover

Beautification of America Block of Stamps First Day Cover

Golden Anniversary American Legion 1919-1969 First Day Cover

Grandma Moses, 1860-1961 First Day Cover

American Flag First Day Cover

California Bicentennial 1769-1969 First Day Cover