Forschungen zur osteuropäischen Geschichte.
Klug, EkkehardFürstentum Tveŕ (1247-1485)
Bater, James H.Modernization and public health in St. Petersburg, 1890-1914.

1985.
Das Fürstentum Tveŕ (1247-1485) / Ekkehard Klug -- Modernization and public health in St. Petersburg, 1880-1914 / James H. Bater.
Sanitation