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I have a set of old-ish (1987, I think) Popular Science Encyclopedias (6 volumes) the ISBN is for the whole set though.
I think they are a great science resource, but by the time my kids are old enough to look things up on their own these might be outdated.
I purchased them from ebay, and it was only after purchase I figured out their age AND that they came from a smoking home. I've aired them out, but you know how that goes!
If anyone is interested in one or the set just let me know.