Soil testing : correlating and interpreting the analytical results - Kral, David M. (American Society of Agronomy, 1978)
Proceedings of a symposium sponsored by Division S-4, S-8 and A-4 and the Soil Testing and Plant Analysis Committee of the American Society of Agronomy, Crop Science Society of America and Soil Science Society of America.
The papers were presented dwing the anual meetings in knoxville, Tennessee, august, 1975