Martínez, Gustavo A. “THE EFFECT OF LIMING ON THE EXCHANGEABLE MAGNESIUM LEVELS OF TWO HIGHLY WEATHERED SOILS OF PUERTO RICO”. The Journal of Agriculture of the University of Puerto Rico 75, no. 1 (January 1, 1991): 101–104. Accessed December 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/3557.