Attached is a presentation that I delivered at the Philatelic Gathering on March 23, 2024. It's the final version of a presentation that I first made to the Greater Philadelphia Stamp and Collectors Club in early 2023 and to the Lancaster County Philatelic Society in late 2023.
It's titled, "A Tour of U.S. Collecting Possibilities Based on Ad Covers."
Check out my slide deck in PDF that is attached. It is quite well done and fascinating - if I say so myself!
Fascinating. I knew nothing about advertising covers before this.