TY - RPRT TI - Sharp savanna-forest transitions in the Midwest followed environmental gradients but are absent from the modern landscape AU - Caitlin M. Broderick AU - Kelly A Heilman AU - Tamatha Patterson AU - Jody Peters AU - Jason S. McLachlan PY - 2019 DO - 10.1674/0003-0031-180.1.1 UR - https://pubs.usgs.gov/publication/70204105 ID - 70204105 ER -