The sampling of coal in the mine,

Author: Holmes, J. A.
Year: 1918
Issuing Agency: Govt. Print. Off.,
Series: United States. Bureau of Mines. Technical paper ;
Report Number: 1
Subject: Coal--Testing
Links: https://hdl.handle.net/2027/uc2.ark:/13960/t41r6p423
https://hdl.handle.net/2027/mdp.39015077560566
https://hdl.handle.net/2027/uc1.$b32421

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