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WA-RD 690.1
Authors: 
Ken Casavant, Eric Jessup.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Wednesday, August 1, 2007
WA-RD 492.1
Authors: 
Joe P. Mahoney, Martin D. Pietz, Keith W. Anderson, Linda M. Pierce.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Friday, December 1, 2000