1. Soil Organic Matter and its Role in Crop Production.;Allison,1973
2. Bone, S.W., R. Christman, et al. 1975. Ohio erosion control and sediment pollution abatement guide. Bull. 594, Coop. Ext. Serv., Ohio State Univ., Columbus.
3. Fertilizer recommendations for Michigan vegetables and field crops;Christenson,1972
4. A review of root production processes and their influence on soil biota in terrestrial ecosystems;Coleman,1975
5. Dahlman, R.C. and C.L. Kuncera. 1967. Carbon-14 cycling in the root and soil components of a prairie ecosystem. Proc. of the 2nd National Symp. on Radioecology AEC-TID 4500, Conf. 670503.