Ringelmann smoke chart

Author: Kudlich, Rudolf.
Additional Authors: Ringelmann, Max,
Year: 1936
Document Type: USBI
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.27:6888
Series: Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number: 6888
Subject: Smoke prevention
Link: https://hdl.handle.net/2027/mdp.39015077569336

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