Staining from coal burning, Scotland https://geologypics.com/wp-content/uploads/2017/07/geology-pics.png 0 0 Marli Miller https://geologypics.com/wp-content/uploads/2017/07/geology-pics.png Marli Miller2017-04-30 20:13:442017-09-08 13:44:51Staining from coal burning, Scotland
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