Dave:

I have mentioned previously on this group.

The most accurate is the single carved granite "drum" stone measuring 2.00 Rc above the passage leading out of the antechamber of G3 at Giza.

From Petrie...Section #85 “…It has a half-round drum...or roll, sculptured on it (like that in the Second Pyramid...and the width between the square ends, which rested on the jambs, varies from 41.23 to 41.35 the ends are 10.7 to 10.9 wide, making 62.78 to 62.99 length over all…”

The stone was placed in the most obvious location in the most accessible pyramid of the three. Use it for measuring the site…your first step in answering many questions.

Note: The overall dimension of this stone relates to a "function" of the Rc...not a whole unit measure of 3.0 Rc as believed by many.

Good luck on your book...e-mail if you need help.

Best.
Clive