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Portable changeable message signs at work zones.

APA Citation

Dudek, C. L., United States. Federal Highway Administration., Texas. State Department of Highways and Public Transportation., Texas Transportation Institute. (1984). Portable changeable message signs at work zones. College Station, TX: Texas Transportation Institute, Texas A&M University .

MLA Citation

Dudek, Conrad L, United States. Federal Highway Administration, Texas. State Department of Highways and Public Transportation, and Texas Transportation Institute. Portable Changeable Message Signs At Work Zones. College Station, TX: Texas Transportation Institute, Texas A&M University , 1984.

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