1. Geochemistry of some natural radioactive elements in soils;Baranov;Sov. Soil Sci.,1963
2. Ciolkosz, E. J., Cronce, R.J. and Dobos, R.R. (1988). Pennsylvania State University soil characterization manual. Agronomy Series #101, Pennsylvania State University.
3. Genesis of soils and landscapes in the Ridge and Valley province of central Pennsylvania;Ciolkosz;Geomorphology,1990
4. Cole, D.W. and Rapp, M. (1981). Elemental cycling in forest ecosystems. In: Reichle D.E. (ed.), Dynamic properties of forest ecosystems, pp. 341–409. Cambridge Univ. Press.
5. Cronce, R.C. (1988). Genesis of soils overlying dolomite in the Nittany Valley of central Pennsylvania. Ph.D. Thesis, Penn State Univ.