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Filter-paper method for obtaining dust-concentration results comparable to impinger results

Midget microprojector for dust determinations

Size of smallest dust particles revealed by various microscopic systems

Published Year

• 1940-1949 (3)

Subject

• Mines and mineral resources--Dust control--United States (3) *

Author

• Brown, Carlton E. (3) *
• Feicht, Florence L. (1)

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