I then imported the 29 vCards back into Address Book, but I chose 'Keep Both' when the Duplicates warning asked me what I wanted to do. I selected the resulting vCard on my desktop, clicked the right mouse button (CTRL+mouse-click if you have a one-button mouse) to get the context menu, and selected 'Duplicate.' I duplicated this one vCard 28 times. What I did was select the contact I wanted to use to print return address labels - the same address printed on a page of 30 Avery labels (8160) - and drag it to the desktop.
I figured out a way to do this using Address Book without resorting to Word or Print Shop.
