Possibilities for Personnel Development in the Mining and Quarrying sector in Bulgaria

Mariana Petrova, Milena Tepavicharova, Lyudmila Dikova
  • E3S Web of Conferences, January 2018, EDP Sciences
  • DOI: 10.1051/e3sconf/20184104017

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http://dx.doi.org/10.1051/e3sconf/20184104017

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