• Carbon isotope ratios of Great Plains soils and in wheat-fallow systems 

        Author(s):Peterson, G. A.; Lyon, D.; Halvorson, A. D.; Leavitt, S. W.; Paul, Eldor A.; Follett, R. F.
        The purposes of this study were to improve knowledge of regional vegetation patterns of C3 and C4 plants in the North American Great Plains and to use δ13C methodology and long-term research sites to determine contributions ...