Pair of historical books on Duisburg

Lot 1079 limit € 40

1 x Heinrich Averdunk "History of the city of Duisburg up to the final union with the House of Hohenzollern (1666)", with an old city map, Duisburg: printed and published by Johann Ewisch, 1894, half leather (damaged) and 1 x "Festschrift on the inauguration of the town hall - new building of the city of Duisburg am Rhein on May 3, 1902. Written by the building administration with a historical introduction by Professor Averdunk", Duisburg: Steinkamp, 1902, ill. OLn, different Signs of age and use