I am asked a lot about what tanning materials people should use in their part of the world. Well, be careful what you ask for he he. Here is a very large amount of information to address fill that gap. I had already typed up a partial list for a vegetable tanning book project that I have done some writing on which is mostly presented here (don’t hold your breath on me publishing it anytime soon). That information comes largely from Howe’s book on tanning materials, which I think is still in copyright. But I decided to list a bunch of full text excerpts on tanning materials from some other old out of copyright tanning books. To top it off, at the end there is a surprisingly long bibliography of publications on tanning materials put out by the USDA, with such fun topics as tannin content of some acorns, Tannin content of pacific coast trees, tanning materials in South Africa and the tanning industry of Washington state. There is still much more that could be dug up on the subject. If you want to research a specific material more, you can use sites like googlebooks.com and Archive.org Try different combinations of keywords such and as leather, tanning, tannin, the plant’s common names and the plants botanic name (or names, plural since they often change over the course of 100 years or more in order to keep botanists employed and make them look busy).