Value of Brittanica Year Books?

I have a collection of Brittanica Year books from 1960 thru 1974. They are in prime condition. No water damage, no loose pages, no spine breakage, and look as if they have never hardly been read.

I was just wondering if these books might be worth anything as collectables as they cover highlights from all the years. Or would they be worth anything at all?

By Angela A