One of our members, Bob Lemke, writes an interesting blog about vintage cards.
The following are his blogs that discuss the Harrington/Yuengling/Tharps/etc cards:
http://boblemke.blogspot.com/2009/09...00-common.html
http://boblemke.blogspot.com/2009/09...30-tharps.html
The first blog above explains why you won't be completing the set anytime soon.
- Dave