Author
Geological Survey (U.S.)
2
United States. Bureau of Mines
United States. Bureau of Mines. Branch of Data Collection and Coordination
1
United States. Bureau of Mines. Branch of Ferrous Metals
1
United States. Bureau of Mines. Branch of Metals
1
United States. Bureau of Mines. Division of Ferrous Metals
1
United States. Bureau of Mines. Section of Ferrous Metals
1