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Gastambide, S. and Cibes, H.R. 1975. Nutritional Deficiencies of Yams (Dioscorea spp.) and Related Effects on Yield and Leaf Composition. The Journal of Agriculture of the University of Puerto Rico. 59, 4 (Oct. 1975), 264–273. DOI:https://doi.org/10.46429/jaupr.v59i4.10599.