Instructions to Inspectors to Guide Them in The Inspection of Material and Workmanship Used in The Construction of State Aid Roads

USA F. J. Heer Printing Co. 1922 . 79 , At head of title: State of Ohio. Department of highways and public works. Division of highways. 16.

Instructions to Resident Engineers

USA F. J. Heer Printing Co. 1922 . 128 , At head of title: State of Ohio. Department of highways and public works. Division of highways. 16.