Rock Cairns (U.S. National Park Service)
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Rangers, walking groups, urge public to stop making rock towers on hiking trails - ABC News
What Are Cairns? And Why Should You Leave Them Alone?
I Didn't Know That!: Rock Cairns (U.S. National Park Service)
The cairns of Acadia: Objects of wonder, subjects of vandals
The secret life of rock cairns - Wilderness Magazine
Rock Cairns (U.S. National Park Service)
Should be left where they are': National parks refute Yosemite's PSA to knock over cairns
Don't Move Rocks! Friends of the Smokies
20,194 Rock Cairn Images, Stock Photos, 3D objects, & Vectors
See a rock cairn? Push it over, Yosemite National Park says - The Manual
Don't Move Rocks! Friends of the Smokies
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