Here's a really neat book from the early 70's, A Child's World of Stamps by Mildred Depree. Colorful and artistic stamps from all over the world are shown. The accompanying text has stories, poems and customs with interesting and fun facts. For example: "In 1840 the world's first postage stamp was issued in England. It cost one penny and became known as the Penny Black." or "The camel is the ship of the desert." or "Kangaroos like the rain. They often leap for joy during a rainstorm." and "Japan, which means "source of the sun," is a chain of islands in the Pacific, where cherry blossoms, ancient shrines and festival kimonos contrast with modern factories and high-speed trains." I love this stuff.