Hernández-Medina, E. and Lugo-López, M.A. 1958. Observations on the Boron-Manganese Relationships in Soybean and Corn Plants. The Journal of Agriculture of the University of Puerto Rico. 42, 1 (Jan. 1958), 27–34. DOI:https://doi.org/10.46429/jaupr.v42i1.12593.