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new zealand underground coal minesuses of marble in nigeria

New Zealand Underground Coal Minesuses Of Marble In Nigeria

new mexico institute of mining and technology. (1, 2) ing the use of diamond-,drilling equipment and proc- esses in new zealand, by lester g. morrell. of gasifying coal underground; also describes tests made to of acceptable purity can be extracted from nigerian marble, by thomas c. atchison and julius'roth.