Author: Harold Putnam GreenwaldPublisher:
ISBN:
Category : Coal mines and mining
Languages : en
Pages : 26
Book Description
Experiments on Strength of Small Pillars of Coal in the Pittsburgh Bed PDF Download
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Author: Harold Putnam GreenwaldPublisher:
ISBN:
Category : Coal mines and mining
Languages : en
Pages : 26
Book Description
Author: Harold Putnam Greenwald
Author: Harold Putnam Greenwald
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