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The 33 references without a DOI — listed, not checked
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no DOI — not checkedMurad E. 2002 Iron rich precipitates in mine drain environments: mineralogical characteristics and case studies. ‘Proceedings of the 17th World Congress of Soil Science, Thailand. 14–21 August 2002’. p. 2078. (The Soil and Fertilizer Society of Thailand, Bangkok, Thailand.)
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no DOI — not checkedParkhurst D. L. Appelo C. A. 1999 ‘User’s Guide to PhreeqC: a Computer Program for Speciation, Reaction Path, 1d-Transport and Inverse Geochemical Calculations.’ Water-resources Investigations Report 99–4259. U.S. Geological Survey Denver, CO, USA.
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no DOI — not checkedvan Breeman N. 1972 Soil forming processes in acid sulphate soils. ‘Proceedings of the International Symposium on Acid Sulphate Soils, Wageningen, The Netherlands. 13–20 August 1972’. (Ed. H. Dost.) ILRI Publication No. 18, pp. 66–128. (International Institute for Land Reclamation and Improvement: Wageningen, The Netherlands.)
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