I'm looking for advice on how to safely remove price sticker residue from a hard-bound book (happens to be Don Taxay's U.S. Mint and Coinage) without damaging the cover. The book is new, recently purchased online, but I suspect the sticker had been on there for awhile. I was able to remove most of the sticker paper, but much of the glue remains.

My usual scheme is to use transparent tape as a sort of blotter, dabbing it repeatedly on the recalcitrant glue (glue to glue) and lifting it off, but that doesn't seem to be working this time. I didn't want to get too aggressive.

I thought about trying a soft art eraser but before doing that want to see what others recommend, as I can't imagine this being something never before encountered. I did skim through the E-Sylum table of contents archive but nothing popped out (not to say that there isn't something there, but I was going through the pages fairly quickly). Thanks in advance.