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Leopold Nicholas Plein

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Books

A Study of Mine Roof of the Pittsburgh Coal Bed in the Pittsburgh Mining District
A Study of Mine Roof of the Pittsburgh Coal Bed in the Pittsburgh Mining District
James Washington Paul, Leopold Nicholas Plein
Methods of Development and Pillar Extraction in Mining the Pittsburgh Coal Bed in Pennsylvania, West Virginia, and Ohio
Methods of Development and Pillar Extraction in Mining the Pittsburgh Coal Bed in Pennsylvania, West Virginia, and Ohio
James Washington Paul, Leopold Nicholas Plein

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