I have several old gun digest and some other books that were my dads. Are these even worth the space they are taking up?

I see them in antique stores from time to time for around $10 each. IMO, they can be useful in learning about models that are out of production but still in the hands of owners looking to sell them. While the suggested values are no longer applicable, there are plenty of online sources for that.

In your situation you might consider keeping every fourth or fifth year, or maybe something like that. Old reference books can really come in handy, but there is such a thing as "too much of a good thing."

1970's and earlier will bring a little money but not alot. For those you would be best to just price them as a whole lot or just give them to someone who would like to have them. At Gun shows you can buy 1980's and newer for about $5 each but they aint flying off the shelves at that price. I wouldnt throw them away though. Someone here would want them I am sure.

There are some very fine articles that appeared in the Gun Digests over the years whose content would be hard to duplicate; at least this was true before the Internet.

There are a couple in there I wouldn't mind having on my shelf...

I keep all that stuff. Problem is that I seldom get around to reading it.

Yes, once the information is gone, it's gone. My local library had Phil Sharpe's original book on reloading, including the 357 Magnum. THEY TOSSED OR SOLD/Gave away the book.