It's the Six Greater Fruit Jell-O Flavors Recipe Book. Or, as it appeared when folded: the Greater Jell-O Recipe Book, in Six Fruit Flavors. (The Jell-O, not the book.) This unusual and lovely cover is from the 1931 promotional campaign, and it makes one realize that this vast pro-Jell-O ad apparatus was devoted to pushing only SIX flavors. By 31 things were getting grim, but did Jell-O position itself as the cheap prole treat? They did not.

On the contrary.