Black Cauldron

I Have A 1965 Print Of "The Black Cauldron" By Lloyd Alexander. It Is A Little Beat Up (it Was A Library Copy), But It's A Hard Back And In What I Would Consider Fair Condition. The Special Thing About This Book Is That It's Autographed By The Author. I Can't Find Any Info Out There On This One Book. So Any Book Dealers Or Appraisers Out There Who Might Have An Idea, I'd Love To Know. Thanks.