Dr F. F. Rupert of the Mellon Institute, Pittsburgh, sighting through a “dustcounter" by which the number of particles of dust in the air may be determined.
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Bibliographic details
Southland Times, Issue 23664, 12 November 1938, Page 13
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27Dr F. F. Rupert of the Mellon Institute, Pittsburgh, sighting through a “dustcounter" by which the number of particles of dust in the air may be determined. Southland Times, Issue 23664, 12 November 1938, Page 13
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