For a little while, there was a big secret in Chicago Heights. Washington bigwigs were visiting. Mysterious shipments of valuable resources would arrive. Something important was happening on the city’s East Side at a time when most of the world’s attention was focused on armed conflict that had engulfed the globe. The secret turned out to be a gift for the president being put together in a workshop at 12th Street and McKinley Avenue, where the Weber Costello Company long had manufactured school supplies such as blackboards, erasers, maps and globes. The firm’s top mapmakers, including chief cartographer B.E.