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Oak - Wikipedia
List of Quercus species - Wikipedia
Quercus robur - Wikipedia
Oak | Description, Characteristics, Types, & Facts | Britannica
Quercus rubra - USDA Plants Database
Quercus (Oak) – Purdue Arboretum Explorer - Purdue University
Quercus robur (Common Oak, English Oak, European Oak, French Oak …
English oak | Description, Tree, Leaf, Wood, & Facts | Britannica
Common oak - Kew
English Oak (Quercus robur) - British Trees - Woodland Trust