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2. Diagenesis of the Clinton hematite ores of New York;Alling;Bull. Geol. Soc. Amer.,1947
3. A biological reduction method for removing free iron oxides from soils and colloidal clays;Allison;J. Amer. Soc. Agron.,1942
4. Soluble material of soils in relation to their classification and general fertility;Anderson;Tech. Bull. U.S. Dep. Agric.,1942
5. Soil Physics;Baver,1956