Cook, Melville T. “ROOT DISEASES OF SUGAR CANE IN PUERTO RICO PART I.-NORMAL STRUCTURE OF ROOTS”. The Journal of Agriculture of the University of Puerto Rico 19, no. 2 (April 1, 1935): 121–122. Accessed November 26, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/14289.