When Thomas Peacock's publisher came to him asking for a new book, they said there were plenty of books about Lake Superior, trees, rocks ...
"What's left?," thought Peacock.
Then he looked up.
The Forever Sky is published by the Minnesota Historical Society Press.
You can find out more about the Peacock's publishing company, Black Bears and Blueberries Publishing here, along with several of the other books Thomas mentioned, including Grasshopper Girl and Rez Dog.