Precambrian Sioux Quartzite forms forty-foot cliffs on the east side of Blue Mound in Blue Mounds State Park,Minnesota | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Buitenkant, John |
Taille de l’image : | 5121 px × 3412 px |
Model Release : | Non requis |
Restrictions : |
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