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Nevada mountains. Coloured combined optical and infrared satellite image of mountains in Nevada, USA. North is at top. Two rivers are seen running from upper left to lower left and lower right. This is part of the Sierra Nevada range of mountains at the Nevada-California border. The image is 186 kilometres wide. Photographed by Landsat 1 on 15th September 1972. (KEYSTONE/SCIENCE PHOTO LIBRARY/MDA INFORMATION SYSTEMS)