The Great Round World and What Is Going On In It, Vol. 1, No. 37, July 22, 1897: A Weekly Magazine for Boys and Girls
The book covers themselves are a marvel of ingenuity, and, although they are in one piece and can be adjusted to fit perfectly any sized book without cutting the paper, they are also so simple that any boy or girl can use them; as they are already gummed they are always ready for use.