L. Frank Baum,
The Emerald City of Oz — Chapter 25…
(1910)
“ Then Nick Chopper told his friend of the Nome King's tunnel, and how the evil creatures of the North had allied themselves with the underground monarch for the purpose of conquering and destroying Oz. "Well," said the Scarecrow, "it certainly looks bad for Ozma, and all of us. But I believe it is wrong to worry over anything before it happens. It is surely time enough to be sad when our country is despoiled and our people made slaves. ”
