Disappearing Bridges
Photographic catalog by Daniel Alward of historic iron and steel bridges mainly in Pennsylvania.
http://www.venangoil.com/Bridges.html
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The Theodore Burr Covered Bridge Society of Pennsylvania
Promotes the preservation of covered bridges in the state. Includes details of activities, an illustrated guide to truss types and a list of covered bridges in the state.
http://www.tbcbspa.com/
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