I am currently running a Rolemaster campaign set in Middle Earth, TA 1640. I have source material for Rhudaur (where the group is right now), Rivendell, and Angmar.
I have come across this book bundle which features a lot of interesting regions, but the system is not Rolemaster or MERP; it is "Adventures in Middle-Earth".
Is it going to be easy to use this material for Rolemaster, or are they very different systems? What age is it set in?