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Bituminous coal fields of Pennsylvania.

By Pennsylvania..
Harrisburg, 1925 .
v in . 23 cm..

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The performance of a completely automatic domestic bituminous coal stoker in laboratory and home installation tests

By Spicer, Theodore Sprang,.
State College, Pa., The Pennsylvania State College, School of Mineral Industries, 1942 .
xi, 52 p. , "This research program was sponsored jointly by the Commonwealth of Pennsylvania, the Central Pennsylvania Coal Producers Association and carried out under the supervision of the State Department of Mines." 23 cm..

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Métodos modernos de lavra de carvões betuminosos,

By Mauro de Araujo Oliveira, Gabriel..
[Rio de Janeiro] 1944 .
85, [1] p. , At head of title: Republica dos estados unidos do Brasil. Ministério da agricultura ... Departamento nacional da produção mineral ...Divisão de fomento da produção mineral ... 24 cm..

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The changing status of bituminous-coal miners, 1937-46 ...

By Bowden, Witt,.
Washington, D.C., U.S. Govt. print. off., 1946 .
ii, 10 p. , At head of title: United States Dept. of labor ... Bureau of labor statistics ... | "Prepared by Witt Bowden."--Letter of transmittal. | "Reprinted from the Monthly labor review, August 1946."--p. 1. 23 cm..

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In the matter of: the determination of prevailing minimum wages for the bituminous coal industry under the Walsh-Healey public contracts act, February 1-[26] 1955.

By United States..
Washington 1955 .
13 v. (xi, 1984 p.) , Cover title. 27 cm..

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