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1.

図書
図書
1. 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, mineralogy & mining law from the earliest times to the 16th century
Georgius Agricola ; translated by Herbert Clark Hoover & Lou Henry Hoover
出版情報: New York : Dover Publications, 1950
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2.

図書
図書
2. The challenge to liberty
by Herbert Clark Hoover
出版情報: New York : C. Scribner, 1934
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