The book
Old Mills in the Mid-West written by Leslie Swanson was published in 1985. Leslie died in 2003, at the age of 97,
but copies of his book (and indeed his other books on Americana) are currently available via his estate. I've written a fuller
review of the mills book, which gives an introduction to watermills and windmills
in the mid-western states of the USA. Details of how to get hold of the book can be found via the
review page.