| |  Front
 Back | | Title: Obsidian Cliff Yellowstone National Park Wyoming (WY), Post Card (Undivided Back) PM 1917
Description:
This cliff is twelve miles south of Mammoth Hot Springs, a formation of voloanic glass, and the roadway to Beaver Lake runs along its base for 1,000 feet.
| Details |  | | State: | WY | | City: | Yellowstone National Park | | Type: | Post Card (Undivided Back) | | Stamp: | 1c | | Postmark/Cancel: | 1917 WATERLOO, WI |
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