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by Carvell, James D.
Washington : Springfield, Va. : Dept. of Transportation, Federal Highway Administration ; for sale by the National Technical Information Service, 1976
Washington : Springfield, Va. : Dept. of Transportation, Federal Highway Administration ; for sale by the National Technical Information Service, 1976
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Participant notebook for a training course in railroad-highway grade crossing improvement programs /
[Washington, D.C.?] : The Administration, 1978
Rev. 6/78.
Rev. 6/78.
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5
by Saylak, Donald
Washington, D.C. : Springfield, VA : U.S. Dept. of Transportation, Federal Highway Administration, Offices of Research and Development, Implementation Division ; National Technical Information Service [distributor], 1980
Washington, D.C. : Springfield, VA : U.S. Dept. of Transportation, Federal Highway Administration, Offices of Research and Development, Implementation Division ; National Technical Information Service [distributor], 1980
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