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WA-RD 276.1
Authors: 
James D. Chalupnik, Donald Anderson.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Saturday, August 1, 1992
WA-RD 277.1
Authors: 
David C. Hodge, James D. Orrell, Tim R. Strauss.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Tuesday, March 1, 1994

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