Shah, H., N. Jehan, S.S. Rehman and S.S.B. Bukhari. 2019.  Comparative study of climate change and its impact on ring-widths of spruce (Picea smithiana) at Kalam and Kaghan forest divisions, Khyber Pakhtunkhwa, Pakistan. Sarhad Journal of Agriculture, 35(3): 788-797.