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MN-03037-NWR Fractured slab of Sioux Quartzite on the prairie, Touch the Sky National Wildlife Refuge, Rock County, Minnesota...
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Sioux Quartzite on the Prairie

Touch The Sky Ntl. Wildlife Refuge, Minnesota

MN-03037-NWR
Fractured slab of Sioux Quartzite on the prairie, Touch the Sky National Wildlife Refuge, Rock County, Minnesota. Photo © copyright by Gary Alan Nelson.

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