List of permissible mining equipment

Year: 1930
Document Type: MAIN
Issuing Agency: U.S. Dept. of Commerce, Bureau of Mines,
SUDOC: C 22.11:6230
Series: Information circular / Bureau of Mines ;
Report Number: 6230
Subjects: Mining machinery
Mines and mineral resources--Equipment and supplies
Link: https://hdl.handle.net/2027/mdp.39015095083450

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