Liegel, Leon H. “EFFECTS OF ADDING MAGNESIUM NITRATE BEFORE DRY-ASHING ON PHOSPHORUS IN HONDURAS PINE FOLIAGE”. The Journal of Agriculture of the University of Puerto Rico 68, no. 2 (April 1, 1984): 219–221. Accessed July 17, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/7280.