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Quelle: Fotos: http://www.nps.gov/archive/yell/ Foto 1: Opal Terrace & Spring; Mammoth Hot Springs; Photographer unknown; 1964 Foto 2: Main Terrace; Mammoth Hot Springs; Photographer unknown; 1963 Foto 3: Minerva Terrace & Spring; Mammoth Hot Springs; Photographer unknown; 1963 Foto 4: Minerva Terrace & Spring; Mammoth Hot Springs; Photographer unknown; 1963 |