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Den Besten, N. (author)The invention of technology for land reclamation in the 10th century started a unique transformation in the delta. Sand plates were dike-ed and pumped and became polders. Examples of early harbor cities created on the dike-ring are Ooltgensplaat and Oude Tonge. These cities were founded at the main creek of a sand plate. The polders created a...master thesis 2012