Devil's Tower National Monument 1906-1956 Block of Stamps

FIRST DAY OF ISSUE DEVILS TOWER, WYOMING Devil's Tower NATIONAL MONUMENT AN 865 FOOT TOWER OF ROCK, EVIDENCE OF VOLCANIC ACTIVITY THAT OCCURRED MILLIONS OF YEARS AGO. 1906-1956 Art Craft 245 TOWER 1956 WYO 50th ANNIVERSARY DEVILS TOWER NATIONAL MONUMENT 50th ANNIVERSARY DEVILS TOWER NATIONAL MONUMENT FIRST DAY GF ISSUE 50th ANNIVERSARY DEVILS TOWER NATIONAL MONUMENT 50th ANNIVERSARY NATIONAL MONUMENT