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Coal Division Officers and CommitteesJan 1, 1940
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ContentsJan 1, 1949
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ContentsJan 1, 1947
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Foreword By Carleton C. LongJan 1, 1952
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Officers (67f46e31-8b81-4dde-b19f-64ffa500fd88)Jan 1, 1915
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ContentsJan 1, 1909
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ContentsJan 1, 1934
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ContentsJan 1, 1906
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Ore ControlBy F. M. Leonard
Churn-drill hole sludge samples have proved their reliability at Cananea
Jan 5, 1951