Thank you, Matthew. I have reviewed several concluded sales databases as well as open market retail listings, which I assume you have done via Abebook, and find the typical ASKING retail is around $100-150 per volume for sound examples. Yours being the more rare editions, the typical retail would be $125 to $195 each at the retail level.
Unfortunately, I am not seeing many actually sell for anywhere near that much--I found several dozen in library "deaccession" sales (mostly standard editions) that sold for as little as $25 each in recent years, regardless of the edition (personalized, standard guide, etc.) and the track record is not all that strong.
If they were mine, I would likely seek a venue where I could arrange a charitable donation for a tax deduction simply because I don't think private sellers have much chance of placing them in the $100-150 each range, and you could take a write off via IRS form 8283 and use a retail listing from Abebook.com, for example, as a current comp--as long as the total value is under $5,000.
If selling, other than trying a listing on etsy.com, eBay.com or Rubylane.com, about all you can do is try local book dealers and see if they would be willing to buy them outright--but be aware, in most cases you will likely get offers of about 20% of what they consider to be the retail. Again, books such as this are NOT easy to sell.
I wish I could provide a brighter outlook, but in this economy, some items are very stagnant and fine china and old hardbacks are near the top of the list for slow sales.
You could also try a blog post on a site such as http://www.abaa.org/ and see if you get any market response. You have a fine set of books, relatively scarce, and in editions which are difficult to replace but that does not always equate to "easy to sell."
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