Cancellation and Bonus Stamps of:

IOWA
IOWA NPS Sites Include:

California NHT
Effigy Mounds NM
Herbert Hoover NHS
Lewis & Clark NHT
Mormon Pioneer NHT
Silos & Smokestacks NHA
Western Historic Trails Center

IOWA Bonus Sites Include:

Effigy Mounds Anniversary Bonus Stamp
Click the map or links above to see the stamps, if collected yet, and the directions for obtaining them.

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