Clouette, Bruce, and Matthew Roth. Connecticut's Historic Highway Bridges. Newington, Conn.: Connecticut Department of Transportation, 1991.
Darnell, Victor. A Directory of American Bridge-Building Companies, 1840-1900. Washington, D.C.: Society for Industrial Archeology, Occasional Publication No. 4, 1984.
Darnell, Victor. "Lenticular Bridges from East Berlin, Connecticut," Industrial Archaeology 5 (1979): 19-32. This is the definitive history of the company and its bridges.
"The Plant of the Berlin Iron Bridge Company," Engineering News (October 3, 1891): 87-91.
Plowden, David. Bridges: the Spans of North America. New York: Viking Press, 1974.

Want to know which Connecticut libraries have these books and periodicals? Use reQuest, the statewide catalog to more than 300 public libraries.
All of the Berlin bridges in Connecticut are listed on the National Register of Historic Places, either individually or as part of historic districts. The National Register documentation forms are filed at the Connecticut Historical Commission, 59 South Prospect Street, Hartford, CT 06106 or telephone 860-566-3005. Except for the following, the nominations were prepared by Bruce Clouette of Public Archaeology Survey Team, Inc.:
Several of the bridges have also been documented by the Historic American Engineering Record (HAER). Copies of the photographs and text are available by contacting HAER (202-343-9626; 1849 C Street, NW, Room NC 300,
Washington, DC 20240-2270) or on-line from the Library of Congress.
Burndy Library, Dibner Institute, Massachusetts Institute of Technology. The Institute has featured Berlin-related items in its on-line newsletter. Victor Darnell's collection of historic bridge materials forms the core of its holdings in this area.
Searching Google for "Berlin Iron Bridge" will turn up additional interesting sites.
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