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SOIL -DEPTH REQUIREMENTS <br />TO RECLAIM <br />SURFACE -MINED AREAS <br />IN THE <br />NORTHERN GREAT PLAINS <br />BY <br />R. C. BARTH AND B. K. MARTIN <br />COLORADO SCHOOL OF MINES RESEARCH INSTITUTE <br />ENVIRONMENTAL TECHNOLOGY DIVISION <br />5920 MCINTYRE STREET <br />GOLDEN, COLORADO 80403 <br />MAY 1982 <br />