OHIO STATE AID ROAD WORK; EXPERIMENTAL ROAD; APPLYING OIL; PETROLITHIC SECTION. OHIO STATE AID ROAD WORK; EXPERIMENTAL ROAD; PETROLITHIC ROLLER AND GANG ROOTER AT WORK. OHIO STATE AID ROAD WORK; EXPERIMENTAL ROAD; APPLYING GLUTRIN. OHIO STATE AID ROAD WORK; EXPERIMENTAL ROAD; APPLYING STANDARD OIL BINDER. OHIO STATE AID ROAD WORK; EXPERIMENTAL ROAD; APPLYING ASPHALTOILENE. OHIO STATE AID ROAD WORK; EXPERIMENTAL ROAD; APPLYING KENTUCKY ROCK ASPHALT. |