158 resultados para 7th grade
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"Work Performed Under Contract No. AC02-77CH00178."
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"ARC 97-4500"--P. [4] of cover.
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Federal Highway Administration, Traffic Systems Division, Washington, D.C.
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Federal Railroad Administration, Office of Policy and Program Development, Washington, D.C.
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Mode of access: Internet.
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Federal Railroad Administration, Office of Research and Development, Washington, D.C.
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Federal Highway Administration, Office of Research and Development, Washington, D.C.
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Federal Highway Administration, Office of Research, Washington, D.C.
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Mode of access: Internet.
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"August 1973."
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Includes bibliographical references.
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Includes bibliographies.
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"August 1988."
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Federal Railroad Administration, Office of Policy and Program Development, Washington, D.C.
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Federal Railroad Administration, Office of Rail Safety Research, Washington, D.C.