In the early 1970s, Bradfield illustrated some of the earliest Sesame Street books. The Together Book, published in 1971, was the first Sesame Street book in the popular line. Compared to modern illustrations of the Sesame characters, Bradfield's linework looks odd and scratchy. His characters have a kind of saggy, loose-limbed quality. In the early days of Sesame merchandising, there wasn't a defined style that the illustrators had to follow; the artists were essentially free to create their own style. Bradfield's art style is distinctive, and memorable. It's not the style that would later become the model, as Joe Mathieu's did. It remains personal and unique.