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