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Pfefer, Ronald C.
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Improved safety information to support highway design / Pfefer, Ronald C.
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Pfefer, Ronald C.
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Pfefer, Ronald C.
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Leisch, Jack E.
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Pfefer, Ronald C., joint author.
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National Research Council (U.S.). Highway Research Board.
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A study of left-hand exit ramps on freeways / Donald S. Berry, Graham L.D. Ross, Ronald C. Pfefer
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