Thickness of Bituminous-Coal and Lignite Seams at All Mines and Thickness of Overburden at Strip Mines in the United States in 1950 Page: 9
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TOTAL U. S.
seeoes 0 49, Y
0* g 90
0-. 001011 01 101 Or
10 j 05 95 '00 d 'd "0
OF~ --~ ~ ////////// /////////
'A " * * 0 " *
soo 4% . ,.
" . . . ,.. ,5
Less then 4ft.
4to 6 ft. 6 to.ft
Figure 1. - Percentage of bituminous coal and lignite produced in the 10 largest coal-producing
States and total United States, by thickness of seams mined 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.. (digital.library.unt.edu/ark:/67531/metadc67062/m1/9/: accessed January 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.