Suspecting that RB might be resorting to devious Forum Code tactics to sneak little plugs in through the back door, I did some investigation.

Assuming that he has converted his number of the book into Roman numerals then, working backwards, we see that

XXX = 30

which can, of course, be expressed as

(7 - 2 + 3 + 2) x 3

Combining numbers in the usual way then produces

7, 23, 23

and these positions in the 26-letter English alphabet correspond to ...

GWW.

In the words of that other famous RB (Richard Burton) in Where Eagles Dare, "Clever, very clever indeed."

Neville.