Pérez-Escolar, R., and M. A. Lugo-López. “The Effect of Synthetic Soil Conditioners on Soil-Aggregate Stability and the Production of Potatoes and Stringless Beans”. The Journal of Agriculture of the University of Puerto Rico 41, no. 2 (April 1, 1957): 127–133. Accessed May 7, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/12623.