sentences:  As the Depression took its toll on magazine finances, Tunis began working on another novel, "Iron Duke", the story of a small-town Iowa football star who struggles to fit in with his elite classmates at Harvard, and eventually finds strength through success as a runner.He wrote the book for adults, but Alfred Harcourt wanted to publish and market it for juveniles.This initially dismayed Tunis, partly because at that time the separate field of young adult fiction did not exist, and Tunis did not consider himself a children's writer.