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Guiscafré-Arrillaga, J. and Gómez, L.A. 1938. STUDIES OF THE ROOT SYSTEM OF COFFEA ARABICA L. Part I.—Environmental Condition Affecting the Distribution of Coffee Roots in Coloso Clay. The Journal of Agriculture of the University of Puerto Rico. 22, 2 (Apr. 1938), 227–262. DOI:https://doi.org/10.46429/jaupr.v22i2.12914.