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Pieter Johannes Hamer . Vereeniging ten behoeve der Arbeidersklasse te Amsterdam bouw libserv tudelft nl tudelft nl Home tudelft nl Pic Creator Pieter Johannes Hamer publication PDold Apartment blocks in Amsterdam Vereeniging ten behoeve der Arbeidersklasse te Amsterdam Pieter Johannes Hamer Huidekoperstraat Amsterdam Achtergracht