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The rivers of the Northern part of European territory of Russia (ETR) contain large amounts of organic matter. This is due to natural features of the area (short cool summer, high wetlands, large areas of forests and features of soil formation), and to specificity of the anthropogenic impact. One of the largest rivers of the Northern ETR is the Northern Dvina River, flowing into the Dvina Bay of the White Sea. A general study of the organic carbon content in the bottom sediment of the Northern Dvina River mouth ar...