= пїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅ пїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅпїЅ 31 31
| [книга] |
| Topical scientific researches into resource-saving technologies of mineral mining and processing |
| |
| Sofia : St. Ivan Rilski |
| 2020 |
ISBN: | 978-954-353-408-1 |
| |
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