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This article incorporates text from this source, which is in the public domain: "Explorers Program". Explorers.gsfc.nasa.gov. 31 January 1958. Archived from the original on 4 March 2016. Retrieved 24 February 2016.
This article incorporates text from this source, which is in the public domain: "Explorer Missions". NASA. Archived from the original on 23 March 2010. Retrieved 28 August 2015.