Hours and earnings in anthracite and bituminous coal mining : anthracite - 1919 and 1920, bituminous - 1919.
| Korporátní autor: | |
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| Typ dokumentu: | Kniha |
| Jazyk: |
angličtina |
| Vydavatel: |
Washington :
Government Printing Office,
1921.
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| Edice: |
Bulletin of the United States Bureau of Labor Statistic ;
No. 279 Wages and hours of labor series |
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