Ringelmann Smoke Chart: Revision of IC 7718
| Year: | 1967 |
|---|---|
| Document Type: | N/A |
| Issuing Agency: | Bureau of Mines Staff |
| SUDOC: | I 28.27:8333 |
| Series: | Information circular (United States. Bureau of Mines) |
| Report Number: | I. C. 8333 |
| Link: | http://digital.library.unt.edu/ark:/67531/metadc67131/ |