Hemming, Debbie, Risto Jalkanen, and Steven W. Leavitt. “Preliminary Relationships Between Climate and the Apical Extension, Needle Production and Ring Width of Pinus Ponderosa in Arizona, USA”. Journal of Palaeosciences 50, no. (1-3) (December 31, 2001): 125–131. Accessed April 29, 2024. https://jpsonline.co.in/index.php/jop/article/view/1816.