Thickness of Bituminous-Coal and Lignite Seams at All Mines and Thickness of Overburden at Strip Mines in the United States in 1950 Page: 13
18 p. : ill., maps ; 27 cm.View a full description of this report.
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LEGEND "-'" / 4% 1 '
Frorn seams less than 4 feet thick ./ . r ---"i
From seams 4 to feet thick
From seams 6 to 8 feet thick
From seams over 8 feet thick
Figure 3. - Percentage of bituminous coal and lignite produced by thickness of seams mined in each State at underground mines in 1950.
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Young, W. H. & Anderson, R. L. Thickness of Bituminous-Coal and Lignite Seams at All Mines and Thickness of Overburden at Strip Mines in the United States in 1950, report, September 1952; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc67062/m1/13/?rotate=90: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.