TY - RPRT TI - Controlled photomosaic of the MTM 20187 Quadrangle, Ma'Adim Vallis Region of Mars AU - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey PY - 1992 DO - 10.3133/i2260 UR - https://pubs.usgs.gov/publication/i2260 ID - i2260 ER -