repair of a paperback book spine - info on how to needed please

My Inkle Weaving text has seen many and better days.  Under the influence of the Aussie climate the pages have come unglued from the cover.  Originally glued in with something that has set like concrete on the spine, and parted ways with the pages.  Pages are all cut, rather than folded at the spine side, but some are in small still together sections, other pages singles and loose, paper is shiny.   Any suggestions welcome - do I remove the gunky set glue and if so how?  Best type of glue to make the repair.  I have lots of bulldog clips for holding together while the repair sets.

It would be helpful to me if I had some idea of the sized of the problem? Number of pages and dimentions?

Here are some threads to help you repair your book:

https://permies.com/t/84166/Repair-Books

https://permies.com/t/369557/repair-paperback-book-spine-info

https://permies.com/t/97983/fix-broken-book

Jay Angler:-  

It would be helpful to me if I had some idea of the sized of the problem? Number of pages and dimentions?

7-1/2 inches wide by 9 inches tall.  Thickness 9/16 inch   214 pages

Ann Miller - Thanks for the links.  For unknown reasons using the search box to find related topics doesn't work. No idea where I'm going wrong.
Those topics were listed once I'd posted the question,  on the "do you want to see your post now" bit.