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Clevis, H.. Investigations into the Historical Topography and Development of the Lower Town between 1300 and 1500, Part I
Clevis, H., Berichten van de Rijksdienst voor het Oudheidkundig Bodemonderzoek, 37 (1987), 38 ( 1988)
Investigations into the Historical Topography and Development of the Lower Town between 1300 and 1500, Part I. 275 - 389 (1987), 392 - 509 (1988)
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