Speaking of World War Two, just before its start E. Saxelby completed a set of 4 textbooks. They’re for learning French. And 80 years after, I discovered the first, En Route, and fourth, Enfants de France in an op shop a couple of days ago.
They are not at all bad. In the introduction the author writes in the introduction that he believes more in experiencing the language than studying its grammar. And so, if you skim only lightly over the exercises, you can ‘self-discover’ French.
The illustrations are cute too—nice and retro in a somewhat Art Deco style.