| Author: | Machisak, John C. | 
|---|---|
| Additional Authors: | Kearney, Naomi W. | 
| Year: | 1958 | 
| Document Type: | USBI | 
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, | 
| SUDOC: | I 28.27:7842 | 
| Series: | Information circular / United States. Bureau of Mines ; | 
| Report Number: | 7842 | 
| Subject: | Quarries and quarrying--Accidents--Statistics | 
| Link: | https://hdl.handle.net/2027/mdp.39015078454330 |