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De re metallica (1912)

Agricola, Georg, Hoover, Herbert · leaf 390

An illustration from De re metallica, 1912, leaf 390
drag it to the torrent . Other miners divert the torrent into the ditches or pits , and others throw the roots of trees , shrubs , and grass out of the ditches or pits with seven - pronged wooden forks . When the torrent has run down , they remove with shovels the uncleansed tin - stone or…

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