Samuels, G., Alers Alers, S., & Landrau, Jr., P. (1957). A Comparison of Different Leaf-Sampling Techniques Used in the Foliar Diagnosis of Sugarcane in Different Countries. The Journal of Agriculture of the University of Puerto Rico, 41(1), 1–10. https://doi.org/10.46429/jaupr.v41i1.12626