984 resultados para Tunnels -- Excavation


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"September 1959."

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"April 1960."

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"March 1993."

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"February 1977."

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National Highway Traffic Safety Administration, Washington, D.C.

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National Highway Traffic Safety Administration, Washington, D.C.

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Federal Highway Administration, Office of Research, Washington, D.C.

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National Highway Traffic Safety Administration, Vehicle Engineering Research Division, Washington, D.C.

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National Highway Traffic Safety Administration, Vehicle Engineering Research Division, Washington, D.C.

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National Highway Traffic Safety Administration, Washington, D.C.