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One of a group of specimens from the Pennsylvania coalfields and elsewhere - a sample of anthracite from Scranton on the northern Pennsylvanian coalfield
One of a group of specimens from the Pennsylvania coalfields and elsewhere - a sample of anthracite from Tamaqua on the southern Pennsylvanian coalfield
One of a group of specimens from the Pennsylvania coalfields and elsewhere - a sample of anthracite from Tuscarora on the southern Pennsylvanian coalfield