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WA-RD 253.2
Authors: 
Charles T. Jahren, Ralph Jones.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Friday, October 1, 1993
WA-RD 253.1
Authors: 
Charles T. Jahren, Ralph Jones.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Friday, October 1, 1993