TY - RPRT TI - Tertiary landslides, northwestern South Dakota and Southeastern Montana AU - James R. Gill PY - 1962 DO - 10.1130/0016-7606(1962)73[725:tlnsda]2.0.co;2 UR - https://pubs.usgs.gov/publication/70220666 ID - 70220666 ER -