The employment of young persons in underground work in mines of all kinds seventh item on the agenda.
| Corporate Authors: | , |
|---|---|
| 格式: | 圖書 |
| 語言: | English |
| 出版: |
Geneva
International Labour Office
1963-
|
| 主題: |
| Corporate Authors: | , |
|---|---|
| 格式: | 圖書 |
| 語言: | English |
| 出版: |
Geneva
International Labour Office
1963-
|
| 主題: |