| Author: | Howes, G. A. | 
|---|---|
| Additional Authors: | Jackson, C. F. | 
| Year: | 1932 | 
| Document Type: | USBI | 
| Issuing Agency: | U.S. Dept. of Commerce, Bureau of Mines, | 
| SUDOC: | C 22.11:6674 | 
| Series: | Information circular / Bureau of Mines ; | 
| Report Number: | 6674 | 
| Subjects: | Shaft sinking--Costs | 
| Mining engineering | |
| Shaft sinking--Technique | |
| Mines and mineral resources--Canada--Ontario | |
| Link: | https://hdl.handle.net/2027/mdp.39015077565037 |