Postcards of the Great Serpent Mound
This is an interesting postcard category. Here are the postcards I have in my collection; as I find more, I'll add them. There is also an older pictorial postmark from Sinking Spring, Ohio, which shows the mound, but I don't have a copy of it yet. I've included who put the postcard out, and the earliest date I've seen it used (when known).
Card #1 - Published by the Ohio State Museum, Columbus. No date.
