The bark of which tree was the original source of making aspirin?
Booth willow Willow bark Willow Osiers Willow trees Willow tree Willowiness Salix Willowy Sallow Hooker’s willow Willows Willowily
willow willow bark hooker s willow osiers willowily salix booth willow willow tree willows willow trees sallow willowiness willowy
willow
WikipediaEntity
Willow