10 years ago , I visited Ara Guler and selected two A3 size bw prints from his collection. He used these prints at his last two pages of his catalog.
Now I want to learn their new prices and place to sell them .
I am sure there are a number of appraisers who could help you with this. Look here for starters.
This brings up an issue I was thinking about recently. There are countless resources/user groups for photographers to ask various questions. But are there any online places for collectors or historians to do the same?
Many museums have collectors' groups that meet in person, but is there such a thing online?
There is a good forum to check on this, but to get the information you're looking for, you will have to subscribe - it is www.artnet.com . They have comprehensive listings of galleries and auction sales.