A set of four pop up books from the World’s Columbian Exposition of 1893 were recently treated in the book conservation lab. The books are part of the Cooper-Hewitt National Design Museum Library World’s Fair materials. The World’s Columbian Exposition took place in Chicago in 1893 and these four books reveal four different views of the exposition. The four books were in good condition for pop-up books. The chromolithographic prints are still vibrant and the paper supports, while brittle, are still in good condition.