– Stable Carbon Isotope Ratios of Miocene Sediments and Fossil Celtis (Ulmaceae) and Berriochloa (Gramineae) Reproductive Structures from the Northern Great Plains Author(s): Jacob Haffnew, Mark L. Gabel and Larry L. Tieszen Year: 1990 Volume: 69 Pages: 145-152 | South Dakota Academy of Science

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