Author: | Harrington, D. |
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Year: | 1920 |
Document Type: | N/A |
Series: | Report of investigations (United States. Bureau of Mines) |
Report Number: | RI-2133 |
Subjects: | Mine safety. |
Mine ventilation. | |
Ventilation, | |
Metal trade. | |
Link: | http://digital.library.unt.edu/ark:/67531/metadc100846/ |