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Ullman, Gerald L.
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Traffic safety evaluation of nighttime and daytime work zones / Ullman, Gerald L.
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Ullman, Gerald L.
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Ullman, Gerald L.
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transit user panels, October 1991 survey results / Ullman, Gerald L.
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transit user panels, May 1992 survey results / Ullman, Gerald L.
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panel : May 1994 survey results / Ullman, Gerald L.
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transit user panel, October 1992 survey results / Ullman, Gerald L.
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Ullman, Gerald L., author.
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traffic information / Ullman, Gerald L., author.
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Ranft, Stephen E.
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Ullman, Gerald L.
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Anderson, S. D. (Stuart D.)
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Ullman, Gerald L.
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National Research Council (U.S.). Transportation Research Board.
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: developed with roadside safety analysis / Richard J. Porter, Kevin M. Mahoney, Gerald L. Ullman -- Tie-downs
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