Kurt Elieson's Historical Context of the Doctrine and Covenants and Other Modern Scriptures is a nice self-published surprise. Elieson, a Texas attorney, saw a hole in the corpus of Doctrine and Covenants commentaries and study guides, and he aimed to fill it. He has succeeded on several fronts.
…Elieson has woven together in one helpful book an up-to-date and remarkably thorough collection of diary accounts and documentary evidence to give depth and context to the story of the receipt (and, importantly, the early circulation) of Joseph Smith's revelations. Because of that, Elieson's book should earn a place on many desks as a ready reference for readers interested in both the Doctrine and Covenants and the history of the Latter-day Saints.