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WA-RD 015.3
Authors: 
Milan Krukar, John C. Cook.
Originator: 
Washington State University. Highway Research Section.
Publication Date: 
Tuesday, July 1, 1969
WA-RD 321.2
Authors: 
Robert D. Holtz.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Monday, January 1, 1996
WA-RD 144.1
Authors: 
Robert D. Strombom.
Originator: 
Fujiki and Associates, Inc.
Publication Date: 
Monday, June 1, 1987
WA-RD 321.1
Authors: 
Robert C. Metcalfe, Robert D. Holtz.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Sunday, May 1, 1994