Hi Dan,
"Windows NT/2000 Native API Reference" by Gary Nebbett http://www.amazon.com/exec/obidos/ASIN/1578701996/ according to my friend who wrote one of the competitors to Shrinker.
I don't know... I looked at its index on amazon.com, and it had no reference to LdrAccessResource. So I suspect this book gives no information about the undocumented aspects of Windows, and probably regurgitates (like so many other API books) the online documentation.
There's also a book called "Undocumented Windows NT". That would probably be the best hope of understanding LdrAccessResource, but without being able to flip through it, I don't know if they cover it.
--Rob