1. Changes in Soil Aggregation and Organic Carbon under Corn and Alfalfa
2. Bruce, R.R., and G.W. Langdale. 1997. Soil carbon level dependence upon crop culture variables in a thermic-udic region. In E.A. Paul, K. Paustian, E.T. Elliott, and C.V. Cole (eds), Soil Organic Matter in Temperate Agroecosystems: Long-Term Experiments in North America, CRC Press, Boca Raton, FL, pp.247-261.
3. Buckner, R.C., J.B. Powell, and R.V. Frakes. 1979. Historical development. In R.C. Buckner and L.P. Bush (eds), Tall Fescue. Agron. Monogr. 20, ASA, Madison, WI, pp.1-8.
4. Burke, I.C., W.K. Lauenroth, and D.G. Milchunas. 1997. Biogeochemistry of managed grasslands in central North America. In E.A. Paul, K. Paustian, E.T. Elliott, and C.V. Cole (eds), Soil Organic Matter in Temperate Agroecosystems: Long-Term Experiments in North America, CRC Press, Boca Raton, FL, pp.85-102.