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United States. Federal Highway Administration. Environmental Division.
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Roads -- United States -- Design and construction.
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National Cooperative Highway Research Program.
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Roads -- United States.
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Stephens, Louis B.
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Roads -- United States -- Management.
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United States. Federal Highway Administration. Environmental Division.
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Roads -- United States -- Design and construction.
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Pickenpaugh, Roger, author.
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Roads -- History -- United States -- 19th century.
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United States. Federal Highway Administration.
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United States. Federal Highway Administration. Environmental Division.
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National Cooperative Highway Research Program.
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United States. Federal Highway Administration.
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Roads -- Safety appliances -- United States -- Cost effectiveness.
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Neuman, Timothy R.
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Roads -- United States -- Safety measures -- Planning.
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