Rolemaster is a system that focuses on offering an in depth simulation of the real world, so you can add a gritty realistic texture to your roleplay.
This page is not as fully detailed as others, as NODDSOC does not have enough to play rolemaster as a system. However, as rolemaster is focused on simulating reality with open ended dice rolls, many of the below books can be useful across systems.
What the Library has:
Arms Law and Claw Law
Character Law and Campaign Law
City Book 1
Creatures and Treasures
Creatures and Treasures II
Elemental Companion
Lords of Middle-Earth
Rolemaster Companion
Rolemaster Companion III
Rolemaster Companion V
Shadow World: Cyclops Vale
Spell Law
The Cloudlords of Tanara