2006 journal article
Growth and survival of Pinus taeda in response to surface and subsurface tillage in the southeastern United States
Forest Ecology and Management, 234(1-3), 209–217.
By: C. Carlson, T. Fox, S. Colbert, D. Kelting, H. Allen & T. Albaugh
1996 journal article
Factors contributing to variability in loblolly pine foliar nutrient concentrations
Southern Journal of Applied Forestry, 20(1), 45.
By: S. Colbert & H. Allen