| Author: | Colby, Shirley F. |
|---|---|
| Year: | 1942 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:7203 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 7203. |
| Subject: | Sand and gravel industry |
| Link: | https://hdl.handle.net/2027/mdp.39015074126700 |