I was looking at this page from Agricola's 1556 treatise on mining and metals, De re metallica, which Wikipedia describes:
It's in Latin, and I wanted to see if there was an English translation available, which is why I was at Wikipedia.
There is indeed. It was translated in 1912 by one Herbert Clark Hoover and Lou Henry Hoover.
Yep, that Herbert Hoover. I knew that Hoover had been a mining engineer, but I didn't know he was also a scholar.
Lou Henry was his wife, an accomplished woman. She held a geology degree from Stanford, and spoke Mandarin.
Hoover gets a bad rap. He was in the wrong place at the wrong time, and his many accomplishments are overshadowed by the crash of 1929.