TY - RPRT TI - Optical ages indicate the southwestern margin of the Green Bay Lobe in Wisconsin, USA, was at its maximum extent until about 18,500 years ago AU - J.W. Attig AU - P.R. Hanson AU - J.E. Rawling AU - A.R. Young AU - E.C. Carson PY - 2011 DO - 10.1016/j.geomorph.2011.04.027 UR - https://pubs.usgs.gov/publication/70036436 ID - 70036436 ER -