Niagara Falls Suspension Bridge Full text of Roebling's final report to the Niagara Falls Suspension Bridge Company. Available in text and pdf formats.
Niagra Bridge Condition Report Full text of Roebling's 1860 report prepared for the presidents and directors of the Niagara Falls Suspension and Niagara Falls International Bridge Companies.
The Roebling Online History Archive Provides a general and social history of the Roebling Company. Includes essays, biographies, timeline, and a walking tour.