Downhill speeds of trucks on mountain grades
By: Prepared by the Arizona Highway Dept., Div. of Economics and Statistics in cooperation with U. S. Department of Commerce, Bureau of Public Roads.
Contributors: United States. Bureau of Public Roads.
Publisher: Highway Dept.
Published: 1950
Place of publication: [Phoenix]
Language: eng
Number of pages: 41
Subjects: Mountain roads.; Roads -- Arizona.
Notes: Cover title.