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This is to certify that your paper entitled «Ventilation system design and main fan selection for block ۳ of the Parvadeh ۴ coal mine based on three-dimensional airflow simulation» was indexed with 12 pages, in the CIVILICA citation database, code COI:JR_JGM-4-1_006, after evaluation and approval of the referees of the "The Journal of Geomine Vol 4, Issue 1 , Year 2026.

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