Talleyrand, Henri, and M. A . Lugo-López. “PRELIMINARY EVALUATION OF TWO NEW HIGH-QUALITY PROTEIN OPAQUE-2 CORN VARIETIES ON AN ACID AND RELATIVELY INFERTILE SOIL (ULTISOL) OF PUERTO RICO”. The Journal of Agriculture of the University of Puerto Rico 60, no. 1 (January 1, 1976): 135–137. Accessed April 24, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/10595.