In the early '90s, there were two copies of
Michael Servetus, His Life and Teachings, Carl Theophilus Odhner, Philadelphia, JB Lippincott Company, 1910, in the United States. One was in a library in the state of New York (I don't remember which one). The book was so rare that the library wouldn't allow me to remove it from the library to do my research, but instead had me make a copy of the book in the library under supervision. I have copies of pages 5-93 of that book.
The Reformation in Its Own Words (possibly in the stacks of the library of Culver Stockton College, Canton, MO),
Servetus and Calvin by Dr Robert Willis, London, 1876, and
Hunted Herretic by Roland H Bainton (which I also have a copy of p 24-67 of) also have large portions of Servetus' original materials transcribed in them. If you are trying to do a research paper and can't find Servetus' works, try finding Calvin's refutations of Servetus' work... often Servetus is quoted at length in those, but the books aren't notated in the cataloguing system as relating to Servetus since he isn't as well known.
I'm hunting for my bibliography, but haven't come across it yet.