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United States. Federal Highway Administration.
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Railroad crossings -- Safety appliances -- United States -- Cost effectiveness.
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United States. Federal Highway Administration. Offices of Research and Development.
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Railroad crossings.
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National Research Council (U.S.). Transportation Research Board.
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Highway-railroad grade crossings -- United States.
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National Research Council (U.S.). Transportation Research Board.
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Highway-railroad grade crossings -- Congresses.
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