(1961). Proceedings of the fifteenth annual Ohio highway engineering conference 1961. Columbus: Ohio State University, Department of Civil Engineering.
Παραπομπή Chicago StyleProceedings of the Fifteenth Annual Ohio Highway Engineering Conference 1961. Columbus: Ohio State University, Department of Civil Engineering, 1961.
Παραπομπή MLAProceedings of the Fifteenth Annual Ohio Highway Engineering Conference 1961. Columbus: Ohio State University, Department of Civil Engineering, 1961.
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