Amazon is selling a kindle copy of that book that I uploaded to Project Gutenberg for $5.99. [www.amazon.com]

Publisher: iOnlineShopping.com (December 10, 2019)

The listing fails to mention that the book is available free at [www.gutenberg.org]

"The Stone Age did not end for lack of stone, and the Oil Age will end long before the world runs out of oil"

-- Sheikh Zaki Yamani