Woodcut illustration from De re metallica by Georgius Agricola. This is a 300dpi scan from the 1950 Dover edition of Herbet Hoover's 1913 translation of the 1556 reference. The Dover edition has slightly smaller size prints than the Hoover (which is a rare book). The woodcuts were recreated for the 1913 printing. Filenames (except for the title page) indicate the chapter (2, 3, 5, etc.) followed by the sequential number of the illustration.
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OCLC318274191. The scan was done by Mining Heritage (http://www.mining-heritage.com/). A CD was purchased from them for low cost. They approve the uploading of these files in addition to recognizing they are out of copyright