10.6084/m9.figshare.5908279.v1 Joseph Peterson Joseph Peterson S1 OPM 6652.pdf figshare 2018 Mammoth Wisconsin Pleistocene Palaeontology (incl. Palynology) 2018-02-21 04:51:54 Figure https://figshare.com/articles/figure/S1_OPM_6652_pdf/5908279 Interactive 3D PDF of Pickett Mammoth tusk (OPM 6652), digitized by Joseph E. Peterson and Ashley Boegh.