Proceedings of the First International Symposium on Wood Tar and Pitch. Held by the Biskupin Museum (Dept. of the State Archaeological Museum in Warsaw) and the Museumsdorf Düppel (Berlin) at Biskupin Museum, Poland, july 1st-4th 1993. - Piotrowski, Wojciech; Brzeziński, Wojciech (Państwowe Muzeum Archeologiczne, Warszawa, 1997)