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18931. Report. 11th annual report by director of Bureau of Mines, fiscal year 1921.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1st edition.] [Dec.] 1921

18932. Mine accidents. Monthly statement of coal-mine fatalities in United States. Oct. 1921; by W. W. Adams.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1st edition.] [Nov.] 1921

18933. Mine accidents. Monthly statement of coal-mine fatalities in United States, Sept. 1921; by W. W. Adams.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1st edition.] [Oct.] 1921

18934. Tungsten. Treatment of tungsten ores of Boulder County. Colo. [with, selected bibliography]; by J. P. Bonardi and J. C. Williams.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1st edition.] [Oct.] 1921

18935. Electric motors. Procedure for establishing list of permissible electric motors, fees, character of tests, conditions under which tests and inspections will be made.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1st edition.] [Sept.] 1921

18936. Mine accidents. Monthly statement of coal-mine fatalities in United States, Aug. 1921; by W. W. Adams.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1st edition.] [Sept.] 1921

18937. Nitrogen oxids. Determination of oxides of nitrogen; by V. C. Allison, W. L. Parker, and G. W. Jones.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1st edition.] [Sept.] 1921

18938. Explosives. Production of explosives in United States during calendar year 1920, with notes on mine accidents due to explosives, by William W. Adams; [and with Permissible explosives tested prior to June 1, 1921, by Spencer P. Howell].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1st edition.] [Aug.] 1921

18939. First aid in illness and injury. Manual of first-aid instruction for miners, by committee of surgeons on standardization of first aid, G. H. Halberstadt, A. F. Knoefel, W. A. Lynott, W. S. Rountree, and M. J. Shields; revised by R. R. Sayers.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1st edition.] [Aug.] 1921

18940. Gas masks for cases met in fishting tires: by Arno C. Fieldner, Sidney H. Katz, and Selwyne P. Kinney.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1st edition revised.] [Aug.] 1921

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