SURFACE MINING IN 1981; REGULATORY REFORM AND AGENCY REVITALIZATION = L'EXPLOITATION EN CIEL OUVERT EN 1981; REFORME DE LA REGLEMENTATION ET REANIMATION DE L'AGENCECONRAD GREGORY E.1982; MIN. CONGR. J.; ISSN 0277-8688; USA; DA. 1982-02; VOL. 68; NO 2; PP. 68-75; 1 TAB. ; ILL.Article

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PROBLEMS IN RECLAIMING FARMLAND IN ILLINOIS = PROBLEMES DE REMISE EN EXPLOITATION DES TERRES AGRICOLES DE L'ILLINOISGRANDT ALTEN F.1981; MIN. ENG.; ISSN 0026-5187; USA; DA. 1981-09; VOL. 33; NO 9; PP. 1347-1351; BIBL. 11 REF.; 4 TAB. ; ILL.Article

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