Looking back to the future: IAPS 10/1988 : proceedings of the 10. bienal conference of the International Association for the Study of People and Their Physical Surroundings, Delft, the Netherlands, July 5 - 8, 1988 = Se retourner vers l'avenir - Hoogdalem, Herbert van; Prak, Niels L.; Voordt, Theo J. M. van der; VanWegen, Herman B. R.