No description available of Harm J. G. Zwaga...
Arnegard, Ruth J., Hammontree, Monty, Montgomery, Melinda J., Pearson, Gwen L. and Zwaga, Harm J. G. (1989): An Evaluation of the Signposting System in a Large Subway Station. In: Proceedings of the Human Factors Society 33rd Annual Meeting 1989. pp. 541-545.
Boersema, Theo and Zwaga, Harm J. G. (1989): Selecting Comprehensible Warning Symbols for Swimming Pool Slides. In: Proceedings of the Human Factors Society 33rd Annual Meeting 1989. pp. 994-998.
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