1
Published: 2010.
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2
Published: c2006.
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3
Published: [2013]
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4
Published: c2006.
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5
Published: 2003.
Superior document: Special report ; 271
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6
Published: 2001.
Superior document: Special report ; 257
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7
Published: 2001.
Superior document: Special report ; 260
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8
Published: c2002.
Superior document: Special report / Transportation Research Board, National Research Council ; 263
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