Welcome to the Book of the Runtime (BOTR) for the .NET Runtime. This contains a collection of articles about the non-trivial internals of the .NET Runtime. Its intended audience are people actually modifying the code or simply wishing to have a deep understanding of the runtime.
Below is a table of contents.
System.Private.CoreLib
and calling into the runtimeIt may be possible that this table is not complete. You can get a complete list by looking at the directory where all the chapters are stored: