| Author: | Spencer, John D. | 
|---|---|
| Additional Authors: | Faber, John H., Joyce, T. J. | 
| Year: | 1966 | 
| Document Type: | USBI | 
| Issuing Agency: | U.S. Bureau of Mines, | 
| SUDOC: | I 28.27:8314 | 
| Series: | Information circular / Bureau of Mines ; | 
| Report Number: | 8314. | 
| Subjects: | Coal-mining machinery | 
| Bulk solids flow | |
| Pneumatic-tube transportation | |
| Link: | https://hdl.handle.net/2027/mdp.39015078514604 |