[PDF] Mechanization Employment And Output Per Man In Bituminous Coal Mining Full Read

Language: en
Pages: 876

Authors: Willard Eugene Hotchkiss

Categories: Bituminous coal

Type: BOOK - Published: 1939 - Publisher:

Language: en
Pages: 492

Authors: United States. Work Projects Administration

Categories:

Type: BOOK - Published: 1939 - Publisher:

Language: en
Pages: 441

Authors: Willard Eugene Hotchkiss

Categories: Bituminous coal

Type: BOOK - Published: 1939 - Publisher:

Language: en
Pages:

Authors:

Categories: Bituminous coal

Type: BOOK - Published: 1937 - Publisher:

Language: en
Pages: 916

Authors: National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.)

Categories: Mineral industries

Type: BOOK - Published: 1937 - Publisher: