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Bog iron

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Bog iron - Wikipedia
https://en.wikipedia.org/wiki/Bog_iron
Bog iron
Collections: Iron, How Did They Make It? Part I, Mining – A Collection of Unmitigated Pedantry
https://acoup.blog/2020/09/18/collections-iron-how-did-they-make-it-part-i-mining/
Bog iron Goethite Hematite Iron Age Iron ores Limonite Magnetite Siderite