TY - RPRT TI - Crater clusters and light mantle at the Apollo 17 site: A result of secondary impact from Tycho AU - Baerbel K. Lucchitta PY - 1977 DO - 10.1016/0019-1035(77)90123-3 UR - https://pubs.usgs.gov/publication/70200524 ID - 70200524 ER -