Bonnet, J.A., Riera, A.R., Rivera Brenes, L. and Orlandi, R. 1949. Tracing the mineral from the soil to the plant to the animal blood Part IV-Effect of urea added to grass fertilized with lime and phosphorus on the nutrition and health of goats. The Journal of Agriculture of the University of Puerto Rico. 33, 2 (Apr. 1949), 67–73. DOI:https://doi.org/10.46429/jaupr.v33i2.12841.