WILSHIRE, H. G. Petrology and stratigraphy of the Fra Mauro formation at the Apollo 14 site / by H. G. Wilshire and E. D. Jackson. -- Washington : United States Government Printing Office, 1972 - 26 p. -- (Geological Survey Professional Paper ; 785). Subjects--Topical Terms: EstratigrafíaPetrología Universal Decimal Class. No.: 552