Łabiszak B., Lewandowska-Wosik A., Pawlaczyk E. M., Urbaniak L. 2017. Variability of morphological needle traits of Scots pine (Pinus sylvestris L.) among populations from mountain and lowland regions of Poland. Folia Forestalia Polonica. 59(2): 134-45. doi:10.1515/ffp-2017-0013