Ortiz, Carlos E., Nilsa M. Acín, and Reinaldo Del Valle, Jr. “MINERAL CONCENTRATION IN ARRACACHA PLANT PARTS”. The Journal of Agriculture of the University of Puerto Rico 81, no. 1-2 (January 1, 1997): 71-74. Accessed December 5, 2021. https://revistas.upr.edu/index.php/jaupr/article/view/3677.