Leusden-Den Treek, pines from the Bølling-Allerød interstadial. Projectnummer...

Dendrochronological research project. For each studied sample a dendrochronological fact sheet including a photo and the average tree-ring measurement series are available...树木年代学（Dendrochronology）研究项目。针对每一份研究样本，均可获取包含照片与平均树木年轮测量序列的树木年代学资料页……