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Humic Substances in the Aquatic and Terrestrial Environment Proceedings of an International Symposium Linköping, Sweden, August 21-23, 1989
- "Humic Substances in the Aquatic and Terrestrial Environment Proceedings of an International Symposium Linköping, Sweden, August 21-23, 1989"
- "Humic Substances in the Aquatic and Terrestrial Environment : Proceedings of an International Symposium Linköping, Sweden, August 21-23, 1989"