Author and historian, Ellen L Puerzer has a new book out. I’ll let her explain:

To anyone interested in octagon houses (50 were built in Wisconsin of which 27 remain)

My book has been published. It contains photos and histories of the 900-some octagon houses that were built in the US and Canada.

Information about ordering the book can be found here. Some sample pages are shown on the website and it looks like a great volume listing all of the surviving octagon houses and many that are demolished.