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Specimen / steel / manufacture / sample / charcoal Specimen / steel / manufacture / sample / charcoal

One of a group of specimens illustrating the manufacture of steel - a sample of charcoal

Specimen / coalfield / sample / coal, bituminous / charcoal, min Specimen / coalfield / sample / coal, bituminous / charcoal, min

One of a group of specimens from the Pennsylvania coalfields and elsewhere - a sample of bituminous coal with mineral charcoal from Mercer County, western Pennsylvania

Ingot Ingot

Ingot, from the Viking age Galloway Hoard

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