Keywords: The Hague sewer system 1907.jpg en The Hague sewer system nl Riolenstelsel Den Haag http //libserv tudelft nl/tresor/books/Architectuur/De_Opmerker/dvd3/mm0_0001/mm0_00fe jpg F C J van den Steen van Ommeren 19 Janiary 1907 publication PD-old Sewerage in The Hague Old maps of The Hague Sewerage maps |