Forth Bridges Visitor Centre Trust
Provides a range of information on both the rail and road bridges. Includes history, images, and related links.
http://www.forthbridges.org.uk/

Mabey Bridge and Shore, Inc.
Sale and rental of temporary panel bridges, prefabricated bridges, and heavy underground shoring equipment like trenchboxes, road plates, and piling equipment.
http://www.mabey.com/

Modern Examples of Road and Railway Bridges
Facsimile of the book which he authored jointly with William Maw. Also available in pdf and tiff formats.
http://bridges.lib.lehigh.edu/books/book1321.html

Bridges to the Past: Alabama's Covered Bridges
Public TV program featuring Alabama's historic covered bridges.
http://www.alabamatv.org/bridges/

NRS AS
NRS AS - Bridge Building Equipment
http://www.nrsas.com/

Atlantic Bridge Systems Inc.
Our total service covers Leasing, Engineering, Pre-bidding, Installation, Supervision, and Maintenance of our many projects throughout Canada.
http://www.atlanticbridgesystems.ca/

Covered Bridges of Maine
The Department of Transportation presents a history of the state's covered bridges and a tour via clickable map: photographs and information on the 9 surviving bridges.
http://www.maine.gov/mdot-stage/covered-bridges/wooden.php

Fletcher Granite Co.

http://www.fletchergranite.com/

First American Macadam Road
System i - iSeries - AS/400 Software and support services...
http://curbstone.com/_macadam.htm

Historic Bridges of Michigan and Elsewhere
Nathan Holth offers information, photographs, and maps for historic bridges, particularly metal truss bridges in the United States and Canada, notably Michigan and Ontario.
http://www.historicbridges.org/