Copper-nickel mining feasibility study, Duluth Gabbro Area, Minnesota : underground - open stoping with backfill /
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Main Author: | |
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Format: | Thesis Book |
Language: | English |
Published: |
1974
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Physical Description: | ix, 252 leaves : illus., maps (fold-out) ; 29 cm. |
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Bibliography: | Bibliographies: leaves 98, 216. |