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: U.S. Department of Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turner...
At head of title: ... Department of commerce. Herbert Hoover, secretary. Bureau of mines. Scott Turn...
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. 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: United States Department of Commerce. R. P. Lamont, secretary. Bureau of Mines. Sc...
At head of title: United States Department of commerce. R.P. Lamont, secretary. Bureau of Mines. Sco...
At head of title: Department of Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turner, dir...
At head of title: U.S. Department of Commerce. R.P. Lamont, secreatary. Bureau of Mines. Scott Turne...
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 Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turne...
At head of title: U.S. Department of commerce. R. P. Lamont, secretary. Bureau of mines. Scott Turne...
At head of title: United States Department of the Interior. Harold L. Ickes, secretary. Bureau of Mi...
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: ... Department of commerce. Herbert Hoover, secretary. Bureau of mines. Scott Turn...
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. 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: United States Department of Commerce. R. P. Lamont, secretary. Bureau of Mines. Sc...
At head of title: United States Department of commerce. R.P. Lamont, secretary. Bureau of Mines. Sco...
At head of title: Department of Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turner, dir...
At head of title: U.S. Department of Commerce. R.P. Lamont, secreatary. Bureau of Mines. Scott Turne...
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 Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turne...
At head of title: U.S. Department of commerce. R. P. Lamont, secretary. Bureau of mines. Scott Turne...
At head of title: United States Department of the Interior. Harold L. Ickes, secretary. Bureau of Mi...
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: ... Department of commerce. Herbert Hoover, secretary. Bureau of mines. Scott Turn...
At head of title: ... Department of commerce. Herbert Hoover, secretary. Bureau of mines. Scott Turn...