Fig. 22 in Pigg et al 2004. Published in American Journal of Botany, 2004. "Hi Hole", County line holes, approximately 11.2 km north off Interstate 82, Firing Center Exit. T14N, R19E, NE 1/4 of NW 1/4 of section 3.
Reference: Pigg, K. B., S. M. Ickert-Bond, and J. Wen. 2004. Anatomically preserved Liquidambar (Altingiaceae) from the middle Miocene of Yakima Canyon, Washington State, USA, and its biogeographic implications. American Journal of Botany 91(3): 499-509.