The Use of Burl in America, by Devere A. Card (oversize pamphlet, 1971, $2)
OK, so just what is a burl????
Actually, it is a "protuberant, abnormal growth found on many species of plants", that could in earlier days be made into bowls, spoons, drinking vessels and other such things. European colonists brought over the skills to make such goods, but Natives knew how to make them long before any Europeans arrived. Included here are many photos. Most of these burl items were practical, with only a few later ones being truly decorative. Most vanished long ago, as they easily wore out and would soon be discarded. Strangely enough, scientists in 1971 still didn't know why burls happen.
Look for this book in the antique section, avail. 12/21.