Thanks Steve for your input!
I was myself surprised the Library would allow sending full prints but I thought maybe because the book is old it is permitted... But you're probably right, there must be a limit to how much of the book you're allowed to copy...
Anyway, good news for everyone.... I actually found a SIZEABLE PART of the book in PDF, and guess where?? On Scott Davies' (author or "Oric Explorer
...) site!!! That was pure luck, I just did a Google search and it gave me this result:
Just click on the "Oric V1.1 ROM.pdf" link and you will get a 133-page excerpt from the book, featuring the whole ROM disassembly and part of the appendices (appendices A to E, so I believe it's missing appendices F to H at least, plus all the technical chapters before the ROM disassembly).
By the way, you're right, the disassembly itself is not that useful especially compared to the one in the French "L'Oric A Nu" book by Fabrice Broche, as the latter has a lot more comments and technical sections in between groups of routines, and also has the advantage of listing both the Oric 1 and Atmos routines side by side... Whereas the Oric Advanced User Guide only features the Atmos 1.1 ROM. Of course, if you don't read French, then "L'Oric A Nu" might not prove as useful...
Anyway, with half of the "Oric Advanced User Guide"' book being already scanned and available in PDF, maybe you would be able to scan part of the rest at least Steve, and maybe other owners of the book could help as well so we can get the full book in PDF??
EDIT: reading your review of this book on your site
Steve, it seems there's a whole chapter that may not really be relevant for scanning, namely the chapter on the disk system as it apparently "offers nothing that didn’t come in the Microdisc manual".