Germans from Russia Heritage Collection from the North Dakota State University Libraries Website
American Historical Society of Germans From Russia
Migration from the Russian Empire [on this website]
Discusses the online database which indexes Russian passengers to New York, 1834-1897, including Germans from Russia.
German Settlements Along the Volga from the Center for Volga German Studies at Concordia University
Odessa Digital Library a German-Russian Genealogical Library -- contains numerous databases related to Germans from Russia