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WA-RD 406.2
Authors: 
William F. Cofer, Sukomal Modak.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Sunday, July 20, 1997
WA-RD 406.1
Authors: 
Sukomal Modak, William F. Cofer.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Tuesday, July 1, 1997