Hours of work in coal mines. [...]. Questionnaire. International labour conference. Fifteenth session, Geneva, May 1931
| Institution: | International Institute of Social History |
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| Format: | TEXT |
| Published: |
International Labour Office,
1930.
Geneva : |
| Subjects: | |
| Online Access: | http://hdl.handle.net/10622/528E083D-B683-4320-B406-6483A3E40C7C |
| Published: | 1930. |
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