Mars Odyssey Release 66 includes new GRS data. Raw data (EDR), Derived Neutron Data (DND), and Derived HEND Data (DHD) products covering the period April 1 through June 30, 2018. Averaged Neutron Data (AND) products cover the period April 26 to July 13, Ls 165 to 210 in year 09. Averaged HEND Data (AHD) products cover the period April 26 to June 18, Ls 165 to 195 in year 09. The data are online at the PDS Geosciences Node at http://pds-geosciences.wustl.edu/missions/odyssey/grs.html.