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Abrams, R. and Juliá, F.J. 1979. Effects of Date of Planting and Planting System on Tomato Yield in the Isabela Area. The Journal of Agriculture of the University of Puerto Rico. 63, 1 (Jan. 1979), 57–63. DOI:https://doi.org/10.46429/jaupr.v63i1.10310.