Actually, I must admit that I never knew there had been comemorative stamps. I would dearly love to see a picture of those, (hint, hint..

BTW, do any of those core samples of yours have gold in them?.....lol. (Which reminds me, Jo, I have the core sample colour photo back from the MMA).
But seriously though John, and everyone, the personal momentos are the best! I would like to mention mine, as being a little tour book given me by Garnette for my wee son. The book got double blessed that evening, when I met up with Dan B. Without hesitation, he picked up the little book and wrote down a message. It said, "Never Give Up", addressed to my son. Evidently, this is his favourite motto or saying. So, this is most cherished, and I'll keep that for the little guy till he gets older. Thus the little motto in my signature at the bottom.
Joy