This book was almost unavailable the past months.
Today, i found two items of this work, hopeful may help to someone:
Author: Nestorius, Patriarch of Constantinople Nestorius, Friedrich Loofs, Georg Kampffmeyer, Stanley Arthur Cook
Possible copyright status: NOT_IN_COPYRIGHT
Digitizing sponsor: Google
Book from the collections of: Harvard University
They are Googlebooks volumes, and can be accessed via Internet Archive:
You can too download they from RapidShare.