What a burl is, what it’s made out of, how it’s formed, which trees are more likely to grow burls & what you should (and shouldn’t!) do if you find a burl.
Burls – Hiker's Notebook
Burl Wood Salvaging and Reclaiming Urban Woods
The Mystery of Tree Burls
What is a burl? - Save the Redwoods League
Burl - Wikipedia
Why redwood burl poaching is so destructive
What is Burl Wood? - Explaining Burl Wood - Redwood Burl Inc.
What is a Burl? Mother Earth's Gift to Men - The Basic Woodworking
What is Burl Wood? It's Weirder Than You Think!, Treehut
The grains of this oak burl. : r/oddlysatisfying
A Definitive Guide to Identifying Tree Burls and Galls