I have been collecting US booklets over many years now. However, even as my collection grows, I am frustrated not by the fact that I know I will never be able to complete it in my life time, but by not knowing how far I still fall short from completion. I have consulted all the relevant literature, such as Furman's well known book. I just find it amazing that there is no definitive answer as to how many booklets there actually are.
Does anyone have any information on large booklet collections being sold/auctioned during the last decade? I'd love to find out more details about them.
I recently stumbled across this article, which is a nice summary of the challenges one faces when collecting booklets.
http://www.philatelicdatabase.com/u...s-challenge/