wrote The Secret of the Ages
comprising 192 pages back in 2016.
Textbook and eTextbook are published under ISBN 1609422341 and 9781609422349.
Since then The Secret of the Ages textbook
was available to sell back to BooksRun online for the top buyback price
or rent at the marketplace.
Robert Collier (1885-1950) was an American author of self-help and metaphysical books. His books have been popular with self-help and New Thought groups. His most known book - The Secret of the Ages - sold over 300,000 copies during his life. In the book "The Secret" Rhonda Byrne writes about it: "The glimpse came in a hundred-year-old book, given to me by my daughter Hayley".