I was in Russia (Tatarstan) in 1993 very near the original Burgdorff home in Stahl. See the very few photos I took while there by clicking here: Kazan
Stahl am Tarlyk is the German name for Stepnoye (the Russian name) and is in the Kukkus District.
Following is the history done by Ted Burgdorff, my Grandfather's nephew...he has done an excellent job of my mother's side of the family:
Click Ted's history of the Burgdorff family on PDF Note: large file over 53mb.