Polish tug Zielona Gora active on the Oder according to a CIA report dated 28 March 1956

An item reported that the Polish Ministry of Waterways was located at Warsaw with her main office at Wroclaw and offices at Szczecin, Kozle, Mowa Sol, Krosno, Milow and Widuchowo. Her tug Zielona Gora with a horsepower of 300 hp was active on the Oder between Wroclaw and Szczecin but now in repair at an unknown shipyard.

Source
The report was published on www.archive.org, document number CIA-RDP83-00418R003300180001-4