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Quelle: Fotos: http://www.nps.gov/archive/yell/ Foto 1: Great Fountain Geyser; Midway & Lower Geyser Basin; William S Keller; 1964 Foto 2: Great Fountain Geyser; Midway & Lower Geyser Basin; JR Douglass; 1970 Foto 3: Pink Cone Geyser; Midway & Lower Geyser Basin; JR Douglass; 1967 Foto 4: White Dome Geyser; Midway & Lower Geyser Basin; J Schmidt; 1977 |