Negative of a photographic postcard showing stalagmites and stalactites in a cave at the Oregon Caves National Monument in Oregon. This area of the cave is known as the "Petrified Forest." Handwriting on negative reads, "Petrified Forest Oregon Caves, Oregon. Christian S-410A." This phrase is written twice on the negative.

Negative of a photographic postcard showing 2 women walking on a path inside a cave at the Oregon Caves National Monument in Oregon. Handwriting on negative reads, "Oregon Caves. Devil's Cradle - River Styx. Christian S-406."