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| Author | : Willard Eugene Hotchkiss |
| Publisher | : |
| Total Pages | : 876 |
| Release | : 1939 |
| Genre | : Bituminous coal |
| ISBN | : |
| Author | : United States. Work Projects Administration |
| Publisher | : |
| Total Pages | : 492 |
| Release | : 1939 |
| Genre | : |
| ISBN | : |
| Author | : United States. Work Projects Administration |
| Publisher | : |
| Total Pages | : 441 |
| Release | : 1939 |
| Genre | : |
| ISBN | : |
| Author | : Willard Eugene Hotchkiss |
| Publisher | : |
| Total Pages | : 441 |
| Release | : 1939 |
| Genre | : Bituminous coal |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 1937 |
| Genre | : Bituminous coal |
| ISBN | : |
| Author | : Willard Eugene Hotchkiss |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 1939 |
| Genre | : Bituminous coal industry |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 1940 |
| Genre | : |
| ISBN | : |
| Author | : United States. Bureau of Labor Statistics |
| Publisher | : |
| Total Pages | : 10 |
| Release | : 1948 |
| Genre | : Coal mines and mining |
| ISBN | : |
| Author | : United States. Bureau of Labor Statistics |
| Publisher | : |
| Total Pages | : 152 |
| Release | : 1961 |
| Genre | : Bituminous coal |
| ISBN | : |
| Author | : United States. Bureau of Labor Statistics |
| Publisher | : |
| Total Pages | : 60 |
| Release | : 1935 |
| Genre | : Labor productivity |
| ISBN | : |
