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1Liburuanork Sack, Ronald L.“...United States. Federal Highway Administration. Offices of Research and Development...”
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2Liburuanork Miklofsky, Haaren A.“...United States. Federal Highway Administration. Offices of Research and Development...”
Argitaratua 1977
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3Conference Proceeding LiburuaArgitaratua 1975“...United States. Federal Highway Administration. Offices of Research and Development...”