The following resources were used in creating this exhibit:
Series 474, Bridge files: photographs, Road Engineer, 1904–1988
King County Archives, Seattle, Washington.
A Context for Common Historic Bridge Types, NCHRP Project 25-25, Task 15
Prepared for the National Cooperative Highway Research Program, Transportation Research Council,
National Research Council by Parsons Brinckerhoff and Engineering and Industrial Heritage, October 2005.
Bridge Truss Types: a guide to dating and identifying
American Association for State and Local History Technical Leaflet 95, History News,
Vol.32, No. 5, May 1977. By T. Allan Comp, Regional Historian Pacific Northwest Region and Donald Jackson, Civil Engineer, Historic American Engineering Record, National Park Service.