Lunar geology
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C.
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Article
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1880
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Elsevier Science
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English
โ 54 KB
experiment continued tbr more than two mouths; the negative pole was covered with a black layer. " Nothing was discovered in this layer by an examination with a microscope. " I requested M. Gaudin, known to the Academy by dif[~rent researches, to try both products on hard stones. " He proved, in