This is one of those finds that can certainly help with genealogical research...and it has. It's the Sons of the American Revolution membership card for my great-granduncle, Joseph Webster GARRISON.
I write about this today because I just received his application in the mail. A quick glance seems to indicated that it may be adding 3 more generations to this line! Not bad for $10. After I have time to digest the information, I'll post more.