Of course Bark was the first known medium used to publish what we now call books.
Charles Lummis was a Library-Poet who published books of poetry on bark, as has been documented here.
On my trip to the graves of America's poets I collected a box full of lovely bark that had been shed from a huge tree over the grave of Carl Sandburg. My intention is to publish a book of poetry on the bark...but I have no experience as to how to actually do this!
I intend to get a calligrapher do write the verses out on the bark, but what ink to use, how thin should it be, and what to treat the bark with are some questions I have.
Any advice or links to information would be greatly appreciated!