Author: Willard Eugene HotchkissPublisher:
ISBN:
Category : Bituminous coal
Languages : en
Pages : 876
Book Description
Mechanization, Employment, and Output Per Man in Bituminous-coal Mining PDF Download
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Author: Willard Eugene HotchkissPublisher:
ISBN:
Category : Bituminous coal
Languages : en
Pages : 876
Book Description
Author: Willard Eugene Hotchkiss
Author: United States. Work Projects Administration
Author: Willard Eugene Hotchkiss
Author: 
Author: Willard Eugene Hotchkiss
Author: Edgar Weinberg
Author: National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.)
Author: United States. Bureau of Mines
Author: United States. Bureau of Labor Statistics
Author: 