1. Andrulewicz E. (1993) National report on war gases and ammunition in the Polish Exclusive Economic Zone of the Baltic Sea, Ad hoc Working Group on Dumped Chemical Munition (HELCOM CHEMU), Report 2/2/4, Vilnius, Lithuania.
2. Dangerous places or cases of irritation by war gas in the Polish sector of the Baltic Sea, (in Polish), The Hydrographic Service of the Polish Navy in Gdynia, 1993, Mimeo.
3. HELCOM CHEMU, 1994, Report on chemical munitions dumped in the Baltic Sea, Rep. 16 Meeting Helsinki Commiss., 8–11 March, 1994.
4. Institute of Meteorology and Water Management — Maritime Branch in Gdynia, 1994, Extract from records on navigation and fishing instructions in the Baltic Sea, Sailor’s Newsletter, Gdynia, 1948–1970), Mimeo., (in Polish).
5. The Maritime Office in Gdynia, 1993, Information on dangerous places in the Polish Economic Zone, Mimeo., (in Polish).