This postcard documents different buttons. Most of the descriptions say “date unknown.” But one of them, 321.8, is from the American Library Association.
I recognized 321.8 as a Dewy Decimal System number and looked it up.
According to LibraryThing, 321.8 is Democratic Government (formerly Republic).
The list of selected works is interesting:
What was the American Library Association getting at?
Sara reports that it’s quite good to be home, and especially nice to see the cats.