Resource books

I had a friend at work who's father in-law passed. These were given to me. Are any of them worth holding on to?

 

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They all look like good reads, I like to keep the hard cover books myself.

 

Sorry for his loss. That was nice of them.
Any error coin books?

 

Quite the library. They all have some value in one way or another. I know the large 'world coin' volumes are very handy for research. The red books are great for handy references but I wouldn't depend on any of the price guides as they are far outdated.