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Arroyo, J.A. and Rivera Brenes, L. 1961. Digestibility Studies on Napier (Merker) Grass (Pennisetum purpureum), Giant Pangola Grass (Digitaria valida Stent), and Signal Grass (Brachiaria brizantha). The Journal of Agriculture of the University of Puerto Rico. 45, 3 (Jul. 1961), 151–156. DOI:https://doi.org/10.46429/jaupr.v45i3.13749.