This image is the cover for the book The Moon Metal, Classics To Go

The Moon Metal, Classics To Go

After huge gold deposits were found in Antarctica and gold became common, the world's financial markets went into a tailspin and every currency lost its value. As bankers meet to find a solution they are approached by one Dr. Syx, who has an evil sneer and a source of a new, mysterious metal to replace gold - a metal which only he can produce. It is up to two heroic engineers try to uncover the secret of this new metal... (Google)

Garrett Putman Serviss

Garrett Putnam Serviss (March 24, 1851 – May 25, 1929) was an American astronomer, populariser of astronomy, and early science fiction writer. Serviss' favourite topic was astronomy, and of the fifteen books he wrote, eight are devoted to it. He unquestionably was more widely read by the public on that topic than anyone prior to his time.

OTB ebook