Author:Louis Laurent Simonin
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|Professor of geology and author of numerous books on geology, mining, minerals and science articles.|
Articles in Popular Science Monthly
Works by this author published before January 1, 1923 are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas.