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Ringelmann Smoke Chart (Revision of I.C. 6888)
| Author: | Burdick, L. R. |
|---|---|
| Year: | 1955 |
| Document Type: | N/A |
| SUDOC: | I 28.27:7718 |
| Series: | Information circular (United States. Bureau of Mines) |
| Report Number: | I. C. 7718 |
| Subject: | Smoke prevention. |
| Link: | https://digital.library.unt.edu/ark:/67531/metadc67067/ |
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