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WA-RD 216.1
Authors: 
Khossrow Babaei, Neil M. Hawkins.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Sunday, March 31, 1991
WA-RD 168.2
Authors: 
Khossrow Babaei, Neil M. Hawkins.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Wednesday, November 30, 1988
WA-RD 168.1
Authors: 
Khossrow Babaei, Neil M. Hawkins.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Thursday, December 1, 1988