SAMUELS, George. The pH of Puerto Rican Soils Used for Principal Crops. The Journal of Agriculture of the University of Puerto Rico, [S. l.], v. 46, n. 2, p. 107–119, 1962. DOI: 10.46429/jaupr.v46i2.12305. Disponível em: https://revistas.upr.edu/index.php/jaupr/article/view/12305. Acesso em: 28 mar. 2024.