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Magnesian Limestone Project (2004–2009) David Carson (GCI) examining magnesium sulfate salt crusts on carved stone at Howden Minster. Photo: Eric Doehne |
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Magnesian Limestone Project (2004–2009) David Carson (GCI) examining magnesium sulfate salt crusts on carved stone at Howden Minster. Photo: Eric Doehne |
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