Farrelly, Niall, Áine Ní Dhubháin, Maarten Nieuwenhuis, and Jim Grant. “The Distribution and Productivity of Sitka Spruce (Picea Sitchensis) in Ireland in Relation to Site, Soil and Climatic Factors.”. Irish Forestry (November 1, 2009). Accessed April 20, 2024. https://journal.societyofirishforesters.ie/index.php/forestry/article/view/10023.