This is an interesting addition to the Joseph Smith file: a bit of background on John Dee:
In the early 1580s the English scholar and magus John Dee undertook an experiment with his “scryer,” who went by the name of Edward Kelley, to try to acquire otherwise inaccessible knowledge by means of invoking and interrogating angels. Kelley, by peering into his “seer stone,” mediated numerous conversations between these angels and Dee, and Dee left detailed transcripts of these encounters. He was told that the lost books of Esdras were still in the hands of the Jews. He was also told that he would be shown the lost books of Enoch quoted by Jude, but there is no record of this happening. Instead, the angels dictated a lengthy revelatory book called Liber Loagaeth, which was to restore all the lost holy books. Unfortunately, it is written in an “angelic” language (called “Enochian” by later followers of Dee) and, apart from a word or two here and there, no translation was ever forthcoming.