Ringelmann number (opacity)
Subtitle: training course notes
By: [prepared by the Air Section of the Projects & Research Division with principal input from P. G. Sagert and B. B. Manna].
Contributors: Sagert, P. G.; Manna, B. B.
Publisher: Air Section, Projects & Research Division
Published: 1974
Place of publication: Victoria, B.C
Language: eng
Number of pages: 39
Subjects: Air -- Pollution -- Measurement.
Notes: Bibliography: p. 38-39.