src: Roebling and his firm had built earlier and smaller suspension bridges, such as Roebling's Delaware Aqueduct in Lackawaxen, Pennsylvania, the John A. Roebling Suspension Bridge in Cincinnati, Ohio, and the Waco Suspension Bridge in Waco, Texas, that served as the engineering prototypes for the final design.
tgt: Roebling e sua empresa construíram pequenas pontes suspensas, como a John A. Roebling Suspension Bridge em Cincinnati, Ohio e a Waco Suspension Bridge em Waco, Texas, estes serviram com protótipos de engenharia para o design final.