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1كتاببواسطة Sack, Ronald L."…United States. Federal Highway Administration. Offices of Research and Development…"
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2كتاببواسطة Miklofsky, Haaren A."…United States. Federal Highway Administration. Offices of Research and Development…"
منشور في 1977
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3وقائع المؤتمر كتابمنشور في 1975"…United States. Federal Highway Administration. Offices of Research and Development…"