“Jacob Williams”, not “Jacobs William”. 
Why do you say the font is not Clarendon? I used this WhatTheFont page to identity the font from an upload of the original manual image. It identified the font as Clarendon. If you overlay my original svg with the image from the original manual, you will see they are identical.
The font in your version does not quite have the same proportions as the one in the original Fortran manual…
(left: manual overlaid on the current logo. right: manual overlaid on yours)