| Author: | Merrill, Robert H. | 
|---|---|
| Additional Authors: | Peterson, Jon, | 
| Year: | 1961 | 
| Document Type: | BMRA | 
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, | 
| SUDOC: | I 28.23:5881 | 
| Series: | Report of investigations / United States Department of the Interior, Bureau of Mines ; | 
| Report Number: | 5881 | 
| Subject: | Boring | 
| Link: | https://hdl.handle.net/2027/mdp.39015078536763 |