Amara, Denis M. K., Patrick A. Sawyerr, Saidu D. Mansaray, and Philip J. Kamanda. “Assessment of Soil Productivity Potentials in Hot Semi-Arid Northern Transition Zone of India Using Riquier Index and GIS Techniques”. Asian Journal of Agriculture and Food Sciences 4, no. 1 (February 15, 2016). Accessed May 3, 2024. https://www.ajouronline.com/index.php/AJAFS/article/view/2921.