AGRICOLA, Georgius (1494-1555). De Re Metallica Translated from the First Latin Edition of 1556 with Biographical Introduction, Annotations and Appendices upon the Development of Mining Methods, Metallurgical Processes, Geology, Minerology & Mining Law from the Earliest Times to the 16th Century. Herbert Clark HOOVER and Lou Henry HOOVER, translators. London: The Mining Magazine, 1912.