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  • Bela Abolfathi, David Aguado, +344 authors Hu Zou
  • Geography, Physics
  • 2017 (First Published: 28 July 2017)
  • The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) has been in operation since 2014 July. This paper describes the second data release from this phase, and the 14th from SDSS overallContinue Reading