While I was in Wyoming, we went to the Grand Teton National Park. This was the stamp that they were using at the Colter Bay Visitor Center and Indian Arts Museum. You can't find it now. Rocky Mountain Region
When I was in Wyoming going to Yellowstone National Park. This was the first stamp I got. It came from Old Faithful Visitor Education Center. Now you can't find it anymore. The stamps came out in the 1980's to the park to use in their passport books. Rocky Mountain Region