I was asked to post a complete picture of the Wonderful Game of Oz board, so here it is. There's a bit of glare but I think the details are all pretty clear if you click on the image for an enlargement.
The game was copyrighted in 1921, and the board shows quite a few characters from The Magic of Oz, which was published in 1919. I don't see anything specifically from Glinda of Oz (1920), so possibly the board was designed before that book was published. At any rate, 67 characters and places are pictured on the board, as well as a few small countries, which I think is doing pretty well!