Soil testing : sampling, correlation, calibration, and interpretation. - Bates, T.; Brown, J.; Dinauer, R.; Holtgraver, K.; Mortvedt, J.; Plank, C.; Randall, G.; Vitosh, M.; Voss, R.; Whitney, D. (Soi Sci Ame, 1987)
Proceedings of a symposium sponsored by Divisions S-4, S-8, A-1, A-4, and the Soil Testing and Plant Analysis Committee (S-877)of the American Society of Agronomy and Soil Science Society of America