It's hard to say what a collection like that would be worth.  I think a lot of the value would be in simply finding the right buyer (auctions, collectors, etc.).  It also might be worth more to try and split the set up and sell the volumes individually.  Just as an example, I bought the above copy on ebay because of Fischer's famous article, but there has been a copy of Vol.1, No. 2 listed at $50 dollars that's been listed for over a year and no one has bought it.

Please bear in mind that I'm hardly an expert or serious collector so what I'm saying may not be entirely accurate and I would definitely recommend consulting someone more knowledgeable if you are looking for more specific information.

Hope this helps a little,

Dan

I was an expert in the 60's and collected Vol.1-Vol 4 of "The American Chess Quarterly"  Vol.1 by the way has 5 issues...any idea what this might be worth.  Thanks in advance...Jeff