In 2012 the book "Bootleg Elvis" focussing on the many bootleg LPs and CDs that have been released since 1977. The book sold out quickly and has since become a collector's item. In the fall of 2018 other authors published a follow-up entitled "The Artistry of Elvis Bootlegs - Seven + Ten Inch From Cover to Vinyl" featuring over 1600 photos of covers of the 7 inch and 10 inch vinyl bootleg releases spread over 300 pages. The focus of this book was on the cover-art.
A follow-up on the bootlegs released on the 12 inch vinyl format, "The Artistry of Elvis Bootlegs - Twelve Inch Albums From Cover to Vinyl" was due early 2019, but has been delayed until at least the end of 2019. The cover and a preview page have been released.
(Source: FECC / Elvis Matters)