I thought I was the only one who has found a cache of those 2 x 4's.
Here is a shot of my stash, all cut neatly. They were all mounted on notebook paper using those old lick-em stick-em photo corners and put in old 3 ring binders, by state.
I've decided I am going to dive in with both feet and study the cancels, as well as the stamps (there are lot's of W/F's)
