On page ix in The New Testament in the Original Greek: Byzantine Textform 2005, we read thus “The primary source for establishing the readings of the Byzantine Textform remains the massive apparatus of Hermann Freiherr von Soden…” and are given the following footnote: “Hermann Freiherr von Soden, Die Schriften Des Neuen Testament in Ihrer Ältesten Erreichbaren Textgestalt, 2 vols. in 4 parts (Göttingen: Vandenhoeck und Ruprecht, 1911).”
There are three places I found this text. Two places on the internet and the third in Logos (pre-pub?). They can be found below, and if anyone knows where I can obtain a physical copy please contact me.
Internet Archive:
Die Schriften des Neuen Testaments in ihrer ältesten erreichbaren Textgestalt hergestellt auf Grund ihrer Textgeschichte (Vol. 1, Pt. 1)
CSNTM:
Die Schriften des neuen Testaments, vol. 1
Die Schriften des neuen Testaments, vol. 2
Die Schriften des neuen Testaments, vol. 3
thomassandberg.ca 