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1by Möller, Ludwig Wilhelm, 1904-
Published 1930Leipzig, Frommhold, 1930.119 p. diagrs., fold. tables. 23 cm.Subjects: “...Coal mines and mining Germany....”
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2by Kandler, Johannes, 1906-
Published 1932Germany : Offenbach a.M., A. Kleinsorge, 1932.xxiv, 124 p., 1 l. tables, diagr. 21 cm.Subjects: “...Coal mines and mining Great Britain....”