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Haley, Wilbur A.
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1
Modified longwall mining with German coal planers : summary of operations at five coal mines
by
Haley
,
Wilbur
A
.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1957
Description: ii, 31 pages : illustrations ; 27 cm.
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2
The use of augers in surface mining of bituminous coal
by
Haley
,
Wilbur
A
.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1957
Description: ii, 22 pages : illustrations ; 27 cm.
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3
Modified longwall mining with a German coal planer (plow) in the Pocohontas No. 4 coal bed, Helen, W. Va
by
Haley
,
Wilbur
A
.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1952
Description: ii, 13 pages, 10 unnumbered leaves of plates : illustrations ; 27 cm.
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4
Mechanical mining in some bituminous-coal mines : progress report [Part] 6, Extraction of pillars with mechanized equipment
by
Haley
,
Wilbur
A
.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1952
Description: iv, 64 pages : illustrations ; 27 cm.
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5
Modified longwall mining with a German coal planer : progress report 2. Completion of mining in three adjacent panels in the Pocahontas no. 4 bed, Helen, W. Va
by
Haley
,
Wilbur
A
.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1954
Description: 13 pages : illustrations ; 27 cm.
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Related Subjects
Coal-mining machinery
Longwall mining Equipment and supplies
Bituminous coal
Bituminous coal industry
Strip mining Equipment and supplies
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