1. The role of soil extractants and soil characteristics in assessing the availability of heavy metals in Maryland soils for the growth of tobacco;Adamu,1987
2. Trace Elements in the Terrestrial Environment;Adriano,1986
3. Recommendations for guidelines;Baker,1985
4. Residual effects from land applied sewage sludge on the agronomic, chemical and physical properties of Maryland tobacco;Bell,1986
5. Effects of sewage sludge on the cadmium and zinc content of crops;CAST;Council for Agri. Sci., Tech. No 83,1980