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181. Safety of life. Sand and Gravel Association safety competition, 1939; [by T. D. Lawrence and C. T. Herring].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: July 11, 1940
SuDoc number:: I 28.26:270

182. National Lime Association safety competition, 1939; [by T. D. Lawrence and J. E. Isaacson].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: May 7, 1940
SuDoc number:: I 28.26:269

183. Coal mines. Accidents and employment at Arkansas coal mines during 1938 and 1939.

Corporate/Agency Authors:: Mines Bureau
Publisher:: Mines Bureau
Date:: [1940.]
SuDoc number:: I 28.26:281

184. Coal mines. Accidents and employment at Kansas coal mines during 1938 and 1939.

Corporate/Agency Authors:: Mines Bureau
Publisher:: Mines Bureau
Date:: [1940.]
SuDoc number:: I 28.26:282

185. Coal mines. Accidents and employment at Maryland coal mines 1938-39.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1940.]
SuDoc number:: I 28.26:277

186. Coal mines. Accidents and employment at Washington coal mines 1938-39.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1940.]
SuDoc number:: I 28.26:278

187. Coal mines. Accidents and employment at Wyoming coal mines during 1938 and 1939.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1940.]
SuDoc number:: I 28.26:275

188. Coal mines. Employment and accidents at coal mines in United States, 1938, final figures.

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1940.]
SuDoc number:: I 28.26:279

189. Copper mines. Employment and accidents at copper mines in United States, 1939; [by M. E. Kolhos and M. B. Jones].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1940.]
SuDoc number:: I 28.26:276

190. Lead mines. Employment and accidents at lead and zinc' mines of Mississippi Valley States, 1939.

Corporate/Agency Authors:: Mines Bureau
Publisher:: Mines Bureau
Date:: [1940.]
SuDoc number:: I 28.26:280

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