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Traffic surveys -- Texas -- Dallas.
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Traffic surveys -- Texas -- Houston.
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Winfrey, Robley, 1899-
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Traffic surveys.
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Ullman, Gerald L.
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Traffic surveys -- Texas -- Dallas.
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Traffic surveys -- Texas -- Houston.
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Cambridge Systematics.
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Traffic surveys -- Data processing.
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National Research Council (U.S.). Highway Research Board. Meeting (31st : 1952 : Washington, D.C.)
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Traffic surveys -- United States.
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National Research Council (U.S.). Highway Research Board. Meeting (43rd : 1964 : Washington, D.C.)
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Traffic surveys -- United States.
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National Research Council (U.S.). Highway Research Board.
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Traffic surveys -- United States.
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Traffic surveys -- Equipment and supplies.
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National Research Council (U.S.). Transportation Research Board.
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Gilfert, James C.
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Traffic surveys -- Ohio -- Data processing.
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