At head of title: U.S. Department of Commerce, R.P. Lamont, secretary. Bureau of Mines. Scott Turner, director ...Mode of access: Internet
At head of title: United States Dept. of the Interior. Harold L. Ickes, secretary. Bureau of Mines, ...
"Interior - Bureau of Mines, Pittsburgh, Pa."--P. 11."May 1951."Mode of access: Internet
At head of title: United States Department of commerce. R.P. Lamont, secretary. Bureau of Mines. Sco...
Running title: Falls of roof and coal in Sewickley bed, W. Va.At head of title: U.S. Department of C...
At head of title: United States Dept. of the interior, Harold L. Ickes, secretary. Bureau of mines, ...
At head of title: ... Department of commerce. Herbert Hoover, secretary. Bureau of mines. Scott Turn...
At head of title: U.S. Department of Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turner...
At head of title: U.S. Department of the Interior. Bureau of Mines. Scott Turner, director.Mode of a...
At head of title: United States Department of the Interior, Harold L. Ickes, secretary. Bureau of Mi...
At head of title: ... United States Department of the Interior. Harold L. Ickes, secretary. Bureau o...
At head of title: U.S. Dept. of Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turner, dir...
At head of title: U.S. Department of Commerce. Daniel C. Roper, secretary. Bureau of Mines. Scott Tu...
At head of title: U.S. Department of the Interior, Office of the Secretary.Xerox copy; Springfield, ...
At head of title: United States Department of interior. Bureau of mines.Caption title.Mode of access...
At head of title: United States Dept. of the interior. Harold L. Ickes, secretary. Bureau of mines. ...
At head of title: United States Dept. of the Interior. Harold L. Ickes, secretary. Bureau of Mines, ...
"Interior - Bureau of Mines, Pittsburgh, Pa."--P. 11."May 1951."Mode of access: Internet
At head of title: United States Department of commerce. R.P. Lamont, secretary. Bureau of Mines. Sco...
Running title: Falls of roof and coal in Sewickley bed, W. Va.At head of title: U.S. Department of C...
At head of title: United States Dept. of the interior, Harold L. Ickes, secretary. Bureau of mines, ...
At head of title: ... Department of commerce. Herbert Hoover, secretary. Bureau of mines. Scott Turn...
At head of title: U.S. Department of Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turner...
At head of title: U.S. Department of the Interior. Bureau of Mines. Scott Turner, director.Mode of a...
At head of title: United States Department of the Interior, Harold L. Ickes, secretary. Bureau of Mi...
At head of title: ... United States Department of the Interior. Harold L. Ickes, secretary. Bureau o...
At head of title: U.S. Dept. of Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turner, dir...
At head of title: U.S. Department of Commerce. Daniel C. Roper, secretary. Bureau of Mines. Scott Tu...
At head of title: U.S. Department of the Interior, Office of the Secretary.Xerox copy; Springfield, ...
At head of title: United States Department of interior. Bureau of mines.Caption title.Mode of access...
At head of title: United States Dept. of the interior. Harold L. Ickes, secretary. Bureau of mines. ...
At head of title: United States Dept. of the Interior. Harold L. Ickes, secretary. Bureau of Mines, ...
"Interior - Bureau of Mines, Pittsburgh, Pa."--P. 11."May 1951."Mode of access: Internet
At head of title: United States Department of commerce. R.P. Lamont, secretary. Bureau of Mines. Sco...