1. Baker, R.G., Fredlund, G.G., Mandel, R.D., Bettis, E.A., III., 2000. Holocene environments of the central Great Plains: multi-proxy evidence from alluvial sequences, southeastern Nebraska. Quaternary International 67 (1), 75–88. doi: 10.1016/S1040-6182(00)00010-0.
2. Measurement of soil organic matter turnover using 13C natural abundance;Balesdent,1996
3. The Holocene stratigraphic record of entrenched stream systems in thick loess regions of the Mississippi River Basin;Bettis,1995
4. Soils and Geomorphology;Birkeland,1999
5. Stable carbon isotope ratios of soil organic matter and their use as indicators of vegetation and climate change;Boutton,1996