https://ia902704.us.archive.org/8/items/ragnarokageoffir00donnuoft/ragnarokageoffir00donnuoft.pdf
This 1883 book is out of print since 2011, and I think the copyright has expired. It is heavy reading and the first few chapters are more geological. Things start to pick up when you get to page 130. That is the book page number not the number that shows on the left hand side as you scroll down.
I have read many articles saying the same thing as Ignatius Donnelly says in this book. Donnelly was a US politician and writer that is enjoying a revival over the past couple of decades. I hope people will find the book interesting and share it as food for thought.
