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Veeraputhran, S., T. Siju, J. Joseph, and K. T. George. “Adoption of RRII 400 Series Rubber Clones by Rubber Small Growers”. Journal of Plantation Crops, vol. 41, no. 2, Aug. 2019, pp. 209-13, https://www.updatepublishing.com/journal/index.php/JPC/article/view/5822.