TY - RPRT TI - Expanded secondary craters in the Arcadia Planitia region, Mars: evidence for tens of Myr-old shallow subsurface ice AU - Donna Viola AU - Alfred S. McEwen AU - Colin M. Dundas AU - Shane Byrne PY - 2015 DO - 10.1016/j.icarus.2014.10.032 UR - https://pubs.usgs.gov/publication/70137247 ID - 70137247 ER -