ABRUÑA-RODRÍGUEZ, F.; VICENTE-CHANDLER, J. Organic-Matter Activity of Some Typical Soils of Puerto Rico. The Journal of Agriculture of the University of Puerto Rico, [S. l.], v. 39, n. 2, p. 65-76, 1955. DOI: 10.46429/jaupr.v39i2.12684. Disponível em: https://revistas.upr.edu/index.php/jaupr/article/view/12684. Acesso em: 8 dec. 2021.