Iron-works -- Africa -- History. / https://id.loc.gov/authorities/subjects/sh85068240 https://id.loc.gov/authorities/subjects/sh85001531-781 https://id.loc.gov/authorities/subjects/sh99005024
Iron-works -- North America -- History -- 18th century. / https://id.loc.gov/authorities/subjects/sh85068240 https://id.loc.gov/authorities/subjects/sh85092455-781 https://id.loc.gov/authorities/subjects/sh2002006124 : Gordon, Robert B.
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Iron-works -- North America -- History -- 19th century. / https://id.loc.gov/authorities/subjects/sh85068240 https://id.loc.gov/authorities/subjects/sh85092455-781 https://id.loc.gov/authorities/subjects/sh2002006167 : Gordon, Robert B.