ABSTRACT
Wage and material costs, 1915-1920 on Oregon highway construction. (in Eng, contr.. vol. 55, Feb. 2, 1921, pp. 1 1 6 )
Extract from biennial report of the Oregon State Highway Commission.
Wages in road building, (in Eng, contr.. vol. 57, May 3, 1 9 2 2, pp. 429)
Tables extracted from the April 15 index of the Associated General Contractors.
