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Evaluation of ground mounted diagrammatic entrance ramp approach signs /
prepared by Helmut T. Zwahlen and Thomas Schnell.

APA Citation

Zwahlen, H. T., Schnell, T., United States. Federal Highway Administration., Ohio. Dept. of Transportation., Ohio Research Institute for Transportation and the Environment. Human Factors and Ergonomics Laboratory. (2000). Evaluation of ground mounted diagrammatic entrance ramp approach signs. Athens: Ohio Research Institute for Transportation and the Environment, Human Factors and Ergonomics Laboratory .

MLA Citation

Ohio Research Institute for Transportation and the Environment. Human Factors and Ergonomics Laboratory, et al.. Evaluation of Ground Mounted Diagrammatic Entrance Ramp Approach Signs. Athens: Ohio Research Institute for Transportation and the Environment, Human Factors and Ergonomics Laboratory , 2000.

Warning: These citations may not always be complete (especially for serials).