@sublime1,
I found a strange mistake in a "Treasury of Illustrated Classics" book called Rebecca of Sunnybrook Farm.
Pages 161 through the end are printed upside down and in the front of the book.
I don't know if this makes it more or less valuable, seeing as it was pretty cheap in the first place, and I don't know how common it is.
Has anyone heard of this, or anything like this, before? Thanks!