I'd like to understand the working of CLR in .Net.
Is there a book out there that's the de-facto standard for describing details, and other helpful information on CLR in .Net? What about that book makes it special?
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As on-line articles I would recommend the CLR Inside out column
As a side and note, I have read the CLR via C# book as stated in this answer and gave a +1, I don't think there is a better book.