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BigBOSS was a plan for an survey in search of baryon acoustic oscillations. I gather that Dark Energy Spectroscopic Instrument (DESI) is the combination of the BigBOSS effort with similar efforts. BigBOSS was to use a purpose-built multi-object spectrograph (BigBOSS Spectrograph) on the Mayall 4m Telescope at Kitt Peak National Observatory (KPNO). It was to have "moderate" spectral resolution, and a wide field of view over which simultaneous targets can be selected.