Books on Banknotes of the USA

I have another question that has been buggin me lately.
I purchased a book on US Banknotes The Official RedBook A Guide to United States Paper Money. In this book the information on small size banknotes can be rather vauge. I found another source (book) that seems to be better and evens mentions the fact that there are small size notes with late finished back plates and othe malidies that create more variety than the Red Book Guide even mentions. Whay do these books differ so much. Does not everyone know what is out there or what has been printed?

I am really confused on this one. Help please if you can.

Can you tell I am starting to read?

 

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You might find things you'd like to read in this thread too:

Information Resources for Paper Money Collectors

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Now that is one thread that is loaded with information.
Thank you Krispy for that link.