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Alder - Wikipedia
Alnus glutinosa - Wikipedia
Alder | Definition, Description, Tree, Wood, & Facts | Britannica
Alder (Alnus glutinosa) - British Trees - Woodland Trust
12 Species of Alder Trees for Your Yard - The Spruce
Alder facts and information | Trees for Life
Complete Guide to Alder Trees | BBC Gardeners World Magazine
Alder Trees: Leaves, Bark, Flowers, Cones - Identification (Pictures)
Alder | The Wildlife Trusts
Alder Tree: Key Facts — Forest Wildlife