wah -- I was called away for a moment then wrote so much more that I exceeded the 10 minutes allowed for an edit --
here goes again -- years ago I belonged to the Alsation League of Great Britain, which eventually was changed to the name German Shepherd League of G B , giving full recognition to the Germanic origins of the breed . In the early 1900's there were English writers Horowitz as sample who made claims that the dog was British - Alsation - Schwaber also has some odd statements - but then so does von Stephanitz -- not only do you have to understand the agriculture and urbanization and keeping both camps happy , you have to understand the social climate and biases of the time which influenced these men ! Anyway , the League put out a yearly hard cover year book and there were some very good articles discussing family lines , historical backgrounds .
Another source , magazines Das Schaferhund Magazin . I just happened to have the June 2002 issue handy . There is a good 5 page discussion on Dasty von Gries , and an article on kennel Zwinger ,, vom Kirchberghof . The magazine was within reach because I had been researching the influence to my breeding program of a a Chip Kirchberghof son that I have , and Chip's sire is Dasty v Gries .