NAV 2009 - Where to find the original Microsoft documentation?

My employer wants to buy a book for me to help with learning the native functionality of NAV 2009 classic client. I've been looking at the book "Microsoft Dynamics NAV 2009 Application Design" by Marije Brummel and I'm only looking at the preview's from Amazon/Google so I can only see a limited number of pages but at the start of chapter 1 there is a short paragraph:

"This book is not a manual for Microsoft Dynamics NAV 2009. It should give a clear idea of how the structure of the application is laid out and about its possibilities. We do not want to replace or rewrite the Microsoft Documentation but rather want to provide ideas you might not have thought about."

I've looked at learn.microsoft.com but all the documentation is for more recent versions of NAV.

Is there a site that has the original documentation for NAV 2009?
What is the best resource for learning the functionality of native NAV 2009? Preferably it shows examples using the classic client.
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