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Science. Physics.        
cut-away look at the earth Geophysics. Cosmic Physics.
 
Explorer I, The First United States SatelliteExplorer I, The First United States Satellite was sent aloft as part of the United States program for the International Geophysical Year 1957-1958, on the evening of January 31, 1958.

Physics of the Earth
THE ROBINSON LIBRARY
Science.--Physics.

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