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| Black coal deep mining (1) |
| Czech part of the Upper Silesian Basin (1) |
| Limit angle (1) |
| Undermined territory (1) |
Now showing items 1-4 of 1
| Black coal deep mining (1) |
| Czech part of the Upper Silesian Basin (1) |
| Limit angle (1) |
| Undermined territory (1) |
