Analyses of Virginia coals ...
[U.S.] Bureau of Mines. Technical paper
Technical paper (United States. Bureau of Mines) ;
United States. Bureau of Mines.
Eby, J. Brian (James Brian), b. 1896
Campbell, Marius Robinson, 1858-1940, joint author.
Paul, James Washington.
Fieldner, Arno Carl, 1881-1966.
Cooper, Harry Mac, 1882- joint author.
Osgood, F. D. (Fred Davidson), 1888-1935, joint author.
Snyder, Ned H.