I am in receipt of a book by Luca Conti entitled, Suoni di Una Terra Incognita: Il Microtonalismo in Nord America (1900-1940). It’s published by Libreria Musicale Italiana. As you may have surmised, it’s in Italian. There is much discussion of Ives, Cowell, Chavez, and Partch. I am mentioned, and several of my articles are listed in the bibliography. There are diagrams with lots of numbers and strangely configured keyboards. It looks interesting.