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Quelle: Fotos: http://www.nps.gov/archive/yell/ Foto 1: Grand Canyon of Yellowstone & the Yellowstone River; Cecil W Stoughton; 1975 Foto 2: Grand Canyon of Yellowstone & the Yellowstone River; Photographer unknown; 1969 Foto 3: Grand Canyon of Yellowstone & the Yellowstone River as seen from Artist Point; R Lake; 1967 |