Tree-ring width of Quercus species from historical object sample 6000B/04A, Netherlands, Groningen

Species: Quercus species; No of rings: 25; Age not determined; Pith: not applicable; Heartwood: absent; Sapwood: absent; Number of sapwood rings: 0; Last ring under bark: absent物种：栎属（Quercus species）；年轮数量：25；年龄未确定；髓心：不适用；心材：无；边材：无；边材年轮数量：0；树皮下的最后年轮：无。