Acevedo, G., Kunze, G. W. and Lugo-López, M. A. (1976) “Morphological, Mineralogical, and Physico-Chemical Characteristics of Some Dark Clay Soils of Puerto Rico”, The Journal of Agriculture of the University of Puerto Rico, 60(4), pp. 491–507. doi: 10.46429/jaupr.v60i4.10494.