Did you know that Oklahoma grows 4.5 million acres of wheat each year? Or that the Selman Bat Cave is the summer home of more than 1 million Mexican free-tailed bats? Discover more exciting facts about the history, geography, and symbols of this state in Oklahoma, part of the Explore the U.S.A. series. Each book in the series uses vibrant images and engaging text to take beginning readers on a journey across the nation.