This is a richly detailed bibliography of J.R.R. Tolkien's writings. (Keep that in mind-- this is not a bibliography of Tolkien criticism or scholarship-- only of Tolkien's own works). Each edition of each work is described in careful detail-- subtle distinctions in the cover, title page, etc. are noted as are variations in spelling, typography, errata and corrections. To be honest, I'm not sure how relevant this work is for the average Tolkien fan-- or even for the Tolkien scholar. It will certainly be useful for book collectors, used/rare booksellers, book appraisers, and others who are interested in the book itself as a physical object)-- but I think there's very little of interest here fans interested in broadening their understanding of Tolkien's fiction or for scholars interested in writing about it. Because of its very limited, very specific utility, I can't really justify a high rating for this. Don't get me wrong-- for what it is, it's thorough and quite excellent. But, I just don't think it's all that *useful* of a book to anyone but a small handful of bibliophiles