Oz, no more

I remember growing up with these books on our family's book shelves. We had about 20 of them, as I recall.In the late 60s my older sister decided she would use the book cover jacket, the dust covers, to make collages with them. She just cut them to pieces. The hard covers were left alone but surely without the jackets the book would be less valuable. I don't know the publisher's date but they were old. The books have disappeared. Oh well...