Heritage of technology - Gdańsk outlook 4, May 4-7, 2005, Gdańsk, Gdynia, Tczew, Malbork, Nowy Dwór Gdański : international conference under the honorary patronage of the Polish National Commission for UNESCO, the rector of the Gdansk University of Technology, and the Mayor of Gdańsk : proceednigs [!] / ed. by Edmund Wittbrodt and Waldemar Affelt. (Gdansk University of Technology, 2005)