Copper production in Russia: Anon. (The
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Article
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1914
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Elsevier Science
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English
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The Atmospheric Obscurity of x912-13. J. MAURER and C. DORNO. (Meteorolog. Zeitschr., xxxi, 49.)--At the beginning of 19i 3 the president of the Radiation Commission of the International Meteorological Committee, J. Maurer, issued a circular letter to meteorological institutes, asking that observati