I'm going to guess that wasn't in 1985. because that was the year I had a summer job in Calgary and went to a big SF con where Poul Anderson, as I recall, was the GoH. I did get a few good Trek books in the dealers' room, though.
Okay, this is... surreal. It's not often I run across people online who I either met or might have met in offline, pre-internet life.
I was at that convention, and met Poul Anderson and his wife. Karen Anderson joined us in Saturday night filking and taught us some of the songs they do in their region in California.
I also remember this cute story Anderson told us about his daughter, when she was a young child. Apparently there was a time in school when the kids were asked to tell the class what their parents did for a living. At that time Anderson was (in addition to his regular writing) involved in a literacy program at a prison.
So as I recall the story... Little Astrid Anderson stood up in class and said, "My daddy is a writer. He often goes to jail."
And... *goes to bookshelf, checks, BINGO!* I have in my hands the book he signed.
Vault of the Ages. I'm currently reading one of his Time Patrol collections, about to get into my umpteenth re-read of "Delenda Est."
Did you also meet Greg Bear (Anderson's son-in-law), who was also at one of the Calgary SF cons? That would have been a few years later. He wrote a Star Trek novel, and that's the book I got him to sign.