In 1947, Jackie Robinson stepped onto the infield grass at Ebbets Field and integrated major league baseball. This online collection, sponsored by the Citigroup Foundation, brings together dozens of items related to his time on the field, including baseball programs, photographs, and other pieces of ephemera. The site includes an interactive timeline and a wonderful essay titled "Early Baseball Pictures, 1860s-1920s." Teachers can also click on the Collection Connections area to learn how to use these materials to teach critical thinking, American history, and social history.