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Kleinmann, R., Majumdar, S. K., Miller, E. W., & Brenner, F. J. (1998). Ecology of wetlands and associated systems. 25: The Pennsylvania Academy of Science Book Publications.
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Fischer, R., Reissig, H., Gockel, G., Seidel, K. H., & Guderitz, T. (1998). Direkte Neutralisation und Untergrundwasserbehandlung des Restwassers im Tagebaurestsee Heide VI. Direct neutralization and treatment of deep subsoil water of the residual water in the open-pit relic lake Heide VI. Braunkohle, Surface Mining, 50(3), 273–278.
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Fernández Rubio, R., Fábregas, A. L., Baquero Ubeda, J. C., & Lorca Fernández, D. (1998). (L. Nel Petrus Johannes, Ed.). Mine Water and Environmental Impacts. 1: Proceedings International Mine Water Association Symposium.
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Dumpleton, S. (1998). Mitigation of minewater pollution; the need for research, monitoring and prevention. Earthwise (Keyworth), 12, 12–13.
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Dill, S., Cowan, J., Wood, A., & Bowell, R. J. (1998). (L. Nel Petrus Johannes, Ed.). Mine Water and Environmental Impacts. 2: Proceedings International Mine Water Association Symposium.
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