PL272185A1 - Method of hydromechanically backfilling post-exploitation areas in particular those involing sulfur mining through bore-holes
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Method of hydromechanically backfilling post-exploitation areas in particular those involing sulfur mining through bore-holes
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PL27218588A1988-04-291988-04-29Method of hydromechanically backfilling a land in particular that after sulfur mining through bore-holes
PL158713B1
(en)