A collection of letters from David Jones to Valerie Wynne-Williams were on auction at Bonham's, London. Information and some images are still available to see here:
Former Archbishop of Canterbury, Rowan Williams, discusses Jones' theology of art in an article for the Catholic Herald (from June 2020) titled "David Jones Saw the in the Mass the Divine Foundation of All Art"
An article in the Church Life Journal from the University of Notre Dame ("The Mark of a Sacramentalist," by Scott Beauchamp) features a discussion of sacramentality in Jones' The Anathemata.
Read it here: churchlifejournal.nd.edu/articles/the-mark-of-a-sacramentalist/