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171. Lead mines. Employment and accidents at lead and zinc mines in Mississippi Valley States, 1940; [by M. E. Kolhos and J. E. Isaacson].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1941.]
SuDoc number:: I 28.26:294

172. Metallurgical plants. Employment and accidents at metallurgical plants in United States in 1939; [by M. E. Kolhos and M. B. Jones].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1941.]
SuDoc number:: I 28.26:288

173. National Lime Association safety competition, 1940; [by T. D. Lawrence and J. E. Isaacson].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1941.]
SuDoc number:: I 28.26:287

174. National Sand and Gravel Association safety competition, 1940; [by T. D. Lawrence and C. T. Herring].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1941.]
SuDoc number:: I 28.26:293

175. Quarries and quarrying. Employment and accidents at quarries and related plants in United States during 1940; [by V. E. Wrenn and L. S. Horton].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1941.]
SuDoc number:: I 28.26:296

176. Safety of life. National Crushed Stone Association safety competition of 1940; [by T. D. Lawrence and J. E. Isaacson].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1941.]
SuDoc number:: I 28.26:289

177. Iron mines and mining. Employment and accidents at iron-ore mines in United States, 1939; [by M. E. Kolhos and C. T. Herring].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: Aug. 2, 1940
SuDoc number:: I 28.26:274

178. Metallurgical plants. Employment and accidents at metallurgical plants in United States in 1938; [by M. E. Kolhos and M. B. Jones].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: July 31, 1940
SuDoc number:: I 28.26:273

179. Metal mines. Accidents and employment at metal mines and nonmetal mines in United States in 1938; [by M. E. Kolhos and M. B. Jones].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: July 18, 1940
SuDoc number:: I 28.26:272

180. Safety of life. National Crushed Stone Association safety competition of 1939; [by T. D. Lawrence and J. E. Isaacson].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: July 18, 1940
SuDoc number:: I 28.26:271

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