1. Geologic map of Apollo landing sites 3 and 3R : part of Oppolzer A region, Sinus Medii Yale Public content 1970. 2012-11-02T15:47:47Z. 2012-11-02T15:47:47Z. Trask, N. J. (Newell Jefferson). U.S. Geological Survey. English. Public. Oppolzer A region and Moon.