General & OtherRingelmann's scale for grading the density of smoke ... Edition of April, 1911United States. Dept. of the Interior. Bureau of Mines![Ringelmann's scale for grading the density of smoke ... Edition of April, 1911]()
Ringelmann's scale for grading the density of smoke ... Edition of April, 1911
United States. Dept. of the Interior. Bureau of Mines
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“Ringelmann's scale for grading the density of smoke ... Edition of April, 1911” by United States. Dept. of the Interior. Bureau of Mines: a public-domain…
Catalogue details
- Author
- United States. Dept. of the Interior. Bureau of Mines
- Category
- General & Other
- Language
- English
- Source
- HathiTrust