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Data sources include incidents reported by HELCOM countries since the establishment of the HELCOM reporting system in 1994, fishing and shoring incidents with chemical warfare materials in Poland(since 1952-1983) and Denmark (1968-1984); the 1991 SACSA report and HELCOM 1994.Further, information about encounters of chemical warfare material by the Nord Stream pipeline project have been included in the dataast.For more details, see the HELCOM report on Dumped chemical munitions in the Baltic Sea (HELCOM 2013).http://www.helcom.fi/Documents/Ministerial2013/Associated%20documents/Background/Dumped%20chemical%20munitions%20in%20the%20Baltic%20Sea.pdfReferences:HELCOM (1994): Report on chemical munitions dumped in the Baltic Sea \u2013report to the 16th Meeting of Helsinki Commission, 8- 11 March 1994, from the Ad Hoc Working Group on Dumped Chemical Munition (HELCOM CHEMU). Danish Environmental Protection Agency (1994).SACSA (1991): Dumping of war gas ammunition \u2013documentation of the Helsinki Commission. 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