We ran the negative and asked if anyone remembered it. There was resounding silence. The facts suggested a Canadian connection so the blogger called up there to the town mentioned, but no answer. When that didn't pan out, the blogger was unable to stand it, so posted a query on Ancestry.com (which you can access via the FCPL system) under the surname in question.
Finally, the blogger received a query from a McGrath descendant in North Carolina (are you following this? Virginia, Canada, North Carolina...). Contact established, the blogger sent the photo to the person in NC. This was back in late November 09.
A few days ago, our blog received a response from the Reston end of the puzzle. This is the gist:
I am just getting involved in this as it is being passed on to me by my McGrath relatives in Canada via my McGrath brother in California. It must have come from me because from time to time I drop books off for donation. (I wish I knew the book title that it was found in). My father must have been reading something while visiting here in VA. He was last here in 2002 and he passed in 2007. Thank you so much for bringing back to us this wonderful negative!!! Also, thanks for bring some cousins together who hardly know each other! We all come from such large families and are all over No America as well as a few on other continents.Sincerely,
(Name Withheld - but it does contain McGrath!)