Now listing on both Amazon and Hippocampus for 31st Oct 2020, Eccentric, Impractical Devils: The Letters of Clark Ashton Smith and August Derleth. 602 pages from Hippocampus Press, edited and annotated by David E. Schultz and S. T. Joshi.

Additional information is found in a March 2019 blog post by S.T. Joshi…

Recently a previously unknown batch of Derleth’s letters to Smith came to light, causing us to refashion the book almost in its totality — and forcing me to re-index nearly the whole of the book. Gawd, what a nightmarish task! But the job is done at last, and I hope the book will emerge soon — along with the huge Clark Ashton Smith bibliography that Scott Connors, David E. Schultz, and I have edited.

Ouch, it sounds like he indexes by hand. Someone tell him about the automated PDF Index Generator, which would at least take care of much of the heavy-lifting of index-building.