Результаты поиска - "Coal mines and mining Pennsylvania"

Annual report on mining activities /

Предметы: “...Coal mines and mining Pennsylvania Statistics Periodicals....”

Selected geologic factors affecting mining of the Pittsburgh coalbed /

Предметы: “...Coal mines and mining Pennsylvania....”

Subsidence over four room-and-pillar sections in southwestern Pennsylvania / по Moebs, Noel N.

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Electrical properties and attenuation distance of upper Pennsylvanian coal measure rock from southwestern Pennsylvania / по Lindroth, David P.

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Flames and embers of coal : a historical novel of the Anthracite region / по Roberts, Ellis W.

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