| | IOWA'S NATIONAL PARKS PASSPORT CANCELLATION STAMPS |
Here is a list with illustrations of the Passport Cancellation Stamps for Iowa's national parks sites and national wildlife refuge. Some bonus stamps from these sites are also exhibited.
| Desoto National Wildlife Refuge |    |
| Effigy Mounds National Monument |     |
| Herbert Hoover National Historic Site |     |
| Lewis and Clark National Historic Trail |  |
| Silos and Smokestacks National Heritage Area |      |
Last updated: March 16, 2022
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