Before revision: He is presented to readers as having been the protagonist of tales of oral folklore told by steelworkers in Pittsburgh, Pennsylvania, which later spread throughout the industrial areas of the Midwestern United States, sometimes referred to as the Rust Belt.
After revision: (see "Origin", below)He is presented to readers as having been the protagonist of tales of oral folklore told by steelworkers in Pittsburgh, Pennsylvania, which later spread throughout the industrial areas of the Midwestern United States, sometimes referred to as the Rust Belt.