Signed book: De Re Metallica. London: Mining Magazine, 1912. Hardcover, 8.75 x 13.5, 640 pages. Georgius Agricola's massive treatise on the properties of various metals, translated from the original 16th century Latin by Hoover and his wife Lou Henry. Signed and inscribed in fountain pen on the first free end page, 'To Mr. and Mrs. Frank M. Warren, with the kind regards of Herbert Hoover.' In fine condition, with some mild page toning, bookplate affixed to inside cover and scattered surface wear to covers. COA John Reznikoff/University Archives and RRAuction COA.
