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161. National Crushed Stone Association safety competition of 1941; [prepared by T. D. Lawrence and J. E. Isaacson].

Corporate/Agency Authors:: Mines Bureau
Publisher:: Mines Bureau
Date:: [1942.]
SuDoc number:: I 28.26:300

162. National Lime Association safety competition of 1941: [by T. D. Lawrence and J. E. Isaacson].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1942.]
SuDoc number:: I 28.26:299

163. National Sand and Gravel Association safety competition, 1941; [prepared by T. D. Lawrence and C. T. Herring].

Corporate/Agency Authors:: Mines Bureau
Publisher:: Mines Bureau
Date:: [1942.]
SuDoc number:: I 28.26:301

164. Quarries and quarrying. Employment and accidents at quarries and related plants in United States during 1941; [by V. E. Wrenn and G. W. Sherman].

Corporate/Agency Authors:: Mines Bureau
Publisher:: Mines Bureau
Date:: [1942.]
SuDoc number:: I 28.26:311

165. Metal mines. Employment and accidents at metal mines and nonmetal mines 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:: Apr. 23, 1941
SuDoc number:: I 28.26:286

166. Coal mines. Emplovment and accidents at coal mines in United States, 1939 (final figures); [by L. E. Geyer and M. G. Parry].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [Apr. 22, 1941.]
SuDoc number:: I 28.26:285

167. Coal mines. Preliminary survey of bituminous-coal-mine occupations on typical workday in 1940; [by W. W. Adams and A. Costanzo].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1941.]
SuDoc number:: I 28.26:290

168. Copper mines. Employment and accidents at copper mines, mills, and smelters in United States in 1940; [by M. E. Kolhos, A. Costanzo, and M. B. Jones].

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1941.]
SuDoc number:: I 28.26:291

169. Gold mines. Employment and accidents at gold, silver, and miscellaneous metal mines 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 28.26:292

170. Iron mines. Employment and accidents at iron-ore mines in United States, 1940; [by M. E. Kolhos and C. T. Herring.]

Corporate/Agency Authors:: Mines Bureau and Interior Department
Publisher:: Mines Bureau
Date:: [1941.]
SuDoc number:: I 28.26:295

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