Pérez Escolar, Raúl, and M. A. Lugo López. “Influence of Degree of Clay-Mineral Crystallization and Free Iron Oxide Content on the Cation Exchange Capacity of Catalina and Cialitos Soils”. The Journal of Agriculture of the University of Puerto Rico 52, no. 2 (April 1, 1968): 148–154. Accessed November 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/11500.