Re: D'deridex class Warbird vs Galaxy class
It doesn't come from the TNG technical manual. Which was written by two people associated with the show (Rick Sternbach & Mike Okuda).
I said tech manuals
which means it could have been any of them, and I know it wasn't from the TNG tech manual, thank you for stating the obvious.
"The first duty of every Starfleet officer is to the truth, whether it is scientific truth or historical truth or personal truth. It is the guiding principle on which Starfleet is based!" - Captain Jean-Luc Picard, 2368