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Abruña, F. et al. 1965. Effects of Liming and Fertilization on Yields and Foliar Composition of High-Yielding Sun-grown Coffee in Puerto Rico. The Journal of Agriculture of the University of Puerto Rico. 49, 4 (Oct. 1965), 413–428. DOI:https://doi.org/10.46429/jaupr.v49i4.13041.