Phil I quite like the use of the Crippled Children labels on the first image.
I've got this souvenir package from Indiana...Hammond Indiana to be exact. Picked it up in an auction lot a few weeks ago.
It folds out into 18 panels (including this cover). It is NOT postal, as there is no place for an address or stamp, and is printed on a heavy paper as opposed to card stock.
But it is of the same genre as the pieces you are showing off.
I don't know what to do with it, so philb, if you would like it for your collection, PM me your address and I'll send it down to you.
Needs a good home.
Here's a couple of more of the panels.
Definitely 1930s or 40s, judging by the 48 star flags and the autos in some of the pictures.