| Investigation of the zinc-lead deposits in horizons below the Grand Falls chert, Galena district Cherokee County, Kansas |
Ruhl, Otto; and Ballinger, H.J. |
U.S. Bureau of Mines, Report of Investigations no. 4398, 119 pages |
1949 |
N/A
|
| Tri-state zinc-lead ore reserves |
Ruhl, Otto |
U.S. Bureau of Mines, Report of Investigations no. 3922, 7 pages |
1946 |
N/A
|
| Unconformity and deposits |
Ruhl, Otto |
Mining and Scientific Press vol. 96, pp. 778-780 |
1908 |
N/A
|
| Zinc-lead ore reserves of the Tri-state district, Missouri-Kansas-Oklahoma |
Ruhl, Otto; Allen, S.A.; and Holt, S.P. |
U.S. Bureau of Mines, Report of Investigations no. 4490, 59 pages |
1949 |
N/A
|