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PRIMUS (for Prism Multi-object Survey) is a spectrographic survey of 130000 galaxies to redshift 1, from a number of existing survey fields covering about 9 steradians, carried out on the Baade Telescope (of the Magellan Telescopes) using the IMACS multi-object spectrograph that was customized to handle these survey goals efficiently, gathering spectra for 2500 targets simultaneously. Data was collect 2006-2008 and analysis has followed.