mmissinglink, Do you mean "Souvenir page" or "Souvenir panel" instead? "Souvenir sheet" has a distinct meaning in the hobby, typically a miniature sheet of some sort. It might help clarify if you could post an example so there is no confusion in your question.
Apparently, the correct term I should have used is Souvenir Page. I've seen Souvenir Pages being described as "Souvenir Sheet" on several different websites and on eBay by a number of sellers......so it is confusing.
Am I incorrect to assume that there isn't a definitive resource which lists all Souvenir Pages?