History of North American Vegetation: Cretaceous, (Maastrichtian) - Tertiary. (In: Flora of North America. Robert W. Kiger, editor)
Reference:
Graham,A. (2000)
History of North American Vegetation: Cretaceous, (Maastrichtian) - Tertiary. (In: Flora of North America. Robert W. Kiger, editor) Flora of North America. Robert W. Kiger, editor
Vol. 1 P.