Map I-621: Geologic map of Apollo landing sites 3 and 3R, part of Oppolzer A region Sinus Medii
USGS Miscellaneous Investigations Series no. I-621 [ORB II-8 (25)]. Prepared in cooperation with the Manned Spacecraft Center, National Aeronautics and Space Administration. Department of the Interior. Accompanying text entitled, "Geologic maps of early Apollo landing sites," by N.J. Trask. Located in the Lloyd Reeds Map Collection, call no. G 3196.C5 1962 MC75P.