I found this book in the Ranke collection, in Special Collections at Syracuse University. Both joints were broken and the boards loose. The leather was missing at the corners and what remained appeared to be only the flesh side.
I cut new boards, and sanded them down to fit against the shoulder. I attached them to the text block with the linen lining. Then I cut a new piece of leather for the spine, and parred the edges. I attached this leather to the spine with paste, as a tight back. After gluing down the turn-ins, I constructed head caps and pressed the book overnight.
Once the new leather was set, I trimmed what overlapped onto the boards and then infilled the board with 10 pt. Next, I covered the board with paste paper, overlapping slightly on the leather. When the paste paper was dry, I trimmed the turn-ins and infilled the inside of the boards. Finally, I glued down the end papers and reattached the original book plates with paste. This was the end result.